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The best backup software for ransomware protection is not the product with the boldest security label. It is a backup design that combines retention-locked or immutable copies, an offline or isolated copy, encryption, point-in-time versions, protected administration, and routinely tested restores. Ransomware commonly searches for reachable backup shares and cloud credentials, then deletes or encrypts recovery data.
Use the comparison framework below to evaluate software and storage targets. A product is only as resilient as the complete system around it: retention policy, credentials, network placement, workload coverage, recovery procedures, and evidence that a clean restore actually works.
What ransomware-resistant backup software must do
Traditional backup software creates copies. Ransomware-resistant backup software must also prevent an attacker who compromises a production computer, server, or administrator account from destroying every usable copy. That requires several independent controls rather than one feature.
- Immutability or retention lock: a defined period during which backup objects cannot be altered or deleted, including by ordinary backup administrators.
- Isolation: at least one copy is offline, air-gapped, or logically separated so a compromised production network cannot reach it.
- Encryption: data is protected in transit and at rest, with keys managed separately from the systems being backed up.
- Versioned recovery: multiple point-in-time versions let you select a restore point from before the ransomware entered the environment.
- Protected administration: multifactor authentication (MFA), least privilege, separate backup credentials, audit logs, and alerts for deletion or policy changes.
- Restore verification: the software can test whether backup files boot, open, or recover into an isolated environment, and the organization performs hands-on recovery drills.
The Cybersecurity and Infrastructure Security Agency (CISA) advises maintaining offline, encrypted backups, regularly testing their availability and integrity, and keeping “golden images” of critical systems. CISA also warns that ransomware often looks for accessible backups and may delete or encrypt them.
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- Slim durable design to help take your important files with you
- Vast capacities up to 6TB[1] to store your photos, videos, music, important documents and more
- Back up smarter with included device management software[2] with defense against ransomware
- Help secure your important files with password protection and hardware encryption
- 3-year limited warranty
No application can make a continuously mounted, fully privileged backup share safe by itself. Resilience comes from combining controls so that failure of one layer does not remove every recovery option.
Features to compare before choosing a product
Request specific answers from each vendor. “Ransomware protection” in a product name is not evidence that your particular repository, edition, or hosting model is protected.
| Comparison area | Questions to ask | Evidence of a strong design |
|---|---|---|
| Isolation | Can compromised production credentials reach, mount, or delete the repository? Is there an offline, air-gapped, or separately administered copy? | At least one copy is unreachable during normal operations, or resides in a separately controlled security domain. |
| Immutability | What exactly is locked: files, objects, snapshots, or the whole repository? Can an administrator shorten retention or remove the lock? | Retention-locked or WORM data with an enforced expiration date and a separately protected policy. |
| Recovery confidence | Are point-in-time versions retained? Does the software detect suspicious encryption? Can it boot or validate restores automatically? | Malware-aware restore selection, automated verification, and scheduled recovery drills. |
| Workload coverage | Does the license protect endpoints, physical servers, virtual machines, SaaS data, databases, applications, and configuration data you actually use? | Native agents or integrations for every critical workload, with application-consistent backups where required. |
| Administration | Does it support MFA, role-based access, separate backup accounts, immutable audit logs, and alerts for deletion or retention changes? | Least-privilege roles, independent credentials, and alerts delivered outside the protected environment. |
| Recovery objectives | What recovery point objective (RPO) and recovery time objective (RTO) are achievable under your data volume and network constraints? | Measured schedules, documented restore order, and sufficient bandwidth and compute for the promised RTO. |
| Operations and cost | How do storage growth, retention length, egress, recovery fees, support, and daily management affect the design? | A forecast using your own change rate and retention, including the cost of a large emergency restore. |
Immutability and retention locks
Immutability is a retention control, not merely a read-only file permission. Veeam describes immutable data as data that cannot be deleted until its expiration date. Acronis describes immutable storage in which restore points cannot be deleted or modified during the configured retention period.
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- Does the lock apply to every backup, or only to selected jobs and repositories?
- Is the expiration calculated from creation time, the latest backup, or a policy change?
- Can a storage administrator, cloud owner, or support operator override the lock?
- Are metadata, catalogs, encryption keys, and configuration backups protected as well as the data blocks?
- What happens when a backup job is deleted or retention is reduced?
A lock that can be shortened by the same account that runs production backups does not provide meaningful separation. Use a separate security role or storage account to set retention, and monitor every attempt to change it. Test the behavior with a noncritical job before placing important systems under the policy.
Isolation: offline, air-gapped, logical, and online copies
Offline copies
An offline copy is disconnected except during a controlled backup or restore. A rotated, encrypted USB disk can serve this purpose for a small environment, provided it is disconnected immediately after the backup and stored securely. CISA specifically warns that an external drive left connected can be reached and corrupted by ransomware.
Air-gapped copies
An air-gapped copy has no routable connection to the production network. It may be stored in a separate facility or on infrastructure that is powered and connected only for controlled operations. Air gaps reduce remote attack paths but require a documented process for media rotation, inventory, and restoration.
Logically isolated copies
A separate cloud account, tenant, subscription, or repository with independent credentials can limit blast radius while remaining online. Logical isolation is stronger when the backup service rejects production credentials, enforces MFA, and prevents a compromised administrator from changing retention.
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- Slim durable design to help take your important files with you
- Back up smarter with included device management software[2] with defense against ransomware
- Help secure your important files with password protection and hardware encryption
- 3-year limited warranty
Online copies
An always-mounted share or repository protected only by a password is convenient but exposed. Treat it as one layer, not the sole recovery source. At least one additional immutable, air-gapped, or offline copy should survive a compromise of the online environment.
Cloud object lock and storage-target controls
Some backup applications write to object storage that provides WORM retention. Backblaze B2 Cloud Storage, for example, documents Object Lock as a WORM model that prevents deletion during a customer-defined retention period. It also documents server-side encryption with managed keys and customer-managed keys. In this arrangement, the storage target supplies part of the protection; the backup application still must handle scheduling, version selection, catalogs, credentials, and restores.
Verify the complete path rather than assuming that “object storage” means immutable:
- Confirm that Object Lock or an equivalent retention mode is enabled for the exact bucket or container receiving backups.
- Set a retention period that covers the longest time in which an infection might remain undetected, plus the time needed to investigate and restore.
- Use a storage account and encryption keys that production administrators cannot alter.
- Check whether object versions, lifecycle rules, replication, and deletion APIs honor the lock.
- Calculate retrieval and egress charges for a full recovery, not just routine uploads.
- Perform a test restore into an isolated account and record the elapsed time and operator steps.
Hardened repositories and automated verification
Veeam Backup & Replication documentation describes immutable repositories and hardened repositories. Its security guidance recommends keeping at least one immutable, air-gapped, or offline copy and using SureBackup recoverability verification. A hardened repository is intended to protect backup files from malware activity or unplanned actions, but the exact protection depends on how the repository, operating system, accounts, and retention are configured.
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When evaluating a hardened repository, confirm that:
- The repository uses a minimal operating system installation and does not share administrator credentials with production servers.
- Backup services have only the permissions they need to write and read data.
- SSH, remote management, and administrative interfaces are restricted to a management network and protected with MFA where supported.
- Retention settings cannot be changed by the account used for ordinary backup jobs.
- Automated verification runs in an isolated virtual lab or equivalent environment, rather than booting an untrusted image on production networks.
Coverage: protect the data attackers will target
List every system that would be needed to resume operations, then map it to a supported backup method. A product that protects laptops but not identity services, databases, or virtualization management is incomplete for a business recovery plan.
- Endpoints: user documents, local application data, and device configuration.
- Physical servers: operating system, applications, system state, and data volumes.
- Virtual machines: machine disks, snapshots where appropriate, and hypervisor configuration.
- Databases: application-consistent backups, transaction logs, and recovery to a specific point in time.
- SaaS: mail, collaboration files, contacts, calendars, and administrative settings; vendor availability is not the same as an independent backup.
- Configuration and identity: directory services, DNS, firewall rules, certificates, automation scripts, and backup-software configuration.
Check licensing boundaries carefully. “Supported” may mean an agent exists, while application-consistent recovery or granular item restore requires a higher edition. Record exclusions before purchase.
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- Big on space: High-capacity storage to store all your files in one place.
- Reliable backup: Safeguard assignments, projects, or sensitive files with trusted performance.
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Recovery confidence: versions, detection, and restore tests
Selecting a clean point in time
Keep enough versions to cover the likely dwell time of an infection. A daily backup with seven retained versions may be insufficient if ransomware is discovered two weeks after encryption began. Use more frequent backups for rapidly changing or high-value systems, and preserve longer-term points separately.
Malware-aware recovery
Some products can flag unusual encryption or identify suspicious restore points. Treat those signals as assistance, not proof that a backup is clean. Validate the selected point with endpoint security, application checks, and a controlled restore.
Automated verification
Automated boot tests can confirm that a virtual machine starts, services respond, and files are readable. They do not prove that every business workflow is intact. Configure tests for representative systems and alert on failures; a verification job that nobody reviews is not a control.
Hands-on restore drills
At least periodically, restore critical systems into an isolated network using only the documented accounts and procedures. Measure the time to locate a clean point, provision compute, restore data, re-establish dependencies, and return users to service. Update the runbook whenever a test exposes a missing credential, unsupported version, or unexpected manual step.
Administration and credential security
Ransomware frequently succeeds because attackers obtain privileged credentials. Separate backup administration from production administration wherever possible.
- Require MFA for consoles, cloud storage, and remote management.
- Create dedicated backup service accounts with no interactive login and no broad domain privileges.
- Use role-based access so operators can run jobs without deleting repositories or changing retention.
- Store recovery keys and emergency credentials in a protected password manager or offline escrow process.
- Send audit logs and deletion or retention-change alerts to a system the attacker cannot modify.
- Review accounts, API tokens, and storage access keys on a fixed schedule; revoke unused credentials.
Back up the backup system itself: job definitions, encryption-key metadata, catalogs, certificates, and repository configuration. Without these, the data may exist but recovery can be delayed while the infrastructure is rebuilt.
RPO and RTO: turn features into recovery outcomes
The recovery point objective is the maximum acceptable amount of data loss, measured in time. The recovery time objective is how long a service may be unavailable. They are not marketing numbers; they depend on schedule frequency, change rate, storage throughput, available compute, and operator workload.
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- USB-C and USB 3.1 connectivity with included 2-in-1 cable The Facet ships with a USB-C to USB-C cable and tethered USB-A adapter, so this external hard drive connects to modern laptops, USB-C iPhones, tablets, and older USB-A computers without buying an extra cable. USB 3.1 Gen 1 (5Gbps) interface delivers real-world transfer speeds up to 100MB/s — fast enough to back up 50GB of files in about 8 minutes.
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| Workload need | Design implication | Measure during a test |
|---|---|---|
| Minutes of data loss | Frequent incrementals, transaction-log protection, or replication; immutable retention must still apply. | Actual interval between usable restore points and log replay time. |
| Same-day recovery | Online immutable copies, preallocated recovery capacity, and documented dependency order. | Time from declaring an incident to a functioning service. |
| Long outage tolerance | Offline media rotation and a lower-cost archival tier may be practical. | Media retrieval, catalog reconstruction, and full restore duration. |
Prioritize identity, networking, security tooling, databases, and core applications before less critical file shares. A restore plan that recovers data but not authentication or DNS cannot bring the business back online.
Comparing common backup architectures
| Architecture | Strengths | Weaknesses and checks |
|---|---|---|
| Hardened on-premises repository | Fast local restores, control over hardware, and support for immutable retention. | Can still be lost to a site disaster; isolate management, protect the host, and add an off-site copy. |
| Cloud object storage with WORM lock | Geographic separation, elastic capacity, and provider-enforced retention. | Recovery depends on bandwidth and may incur egress fees; verify lock mode, keys, account separation, and restore speed. |
| Rotated encrypted USB disks | Simple offline isolation and no continuous network exposure. | Manual rotation, theft or damage risk, limited capacity, and slower restores; disconnect after each backup and test media. |
| Hybrid design | Fast local recovery plus an offline or immutable off-site copy. | More components and operational work; document ownership, schedules, retention, and restore order. |
For most organizations, a hybrid design offers the best balance: a quickly accessible recovery tier, a retention-locked repository, and a genuinely offline or independently administered copy.
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- Inventory critical workloads. Record data owners, dependencies, acceptable data loss, and maximum outage for each system.
- Define retention. Set daily, weekly, monthly, and incident-retention requirements based on how long an infection could remain unnoticed.
- Draw trust boundaries. Mark production networks, backup servers, storage accounts, management networks, and offline media. Identify which credentials cross each boundary.
- Test immutability. Create a noncritical backup, enable the proposed lock, and attempt deletion, overwrite, retention reduction, and key removal with ordinary and privileged accounts.
- Test isolation. Simulate a compromised production credential. Confirm it cannot mount, delete, or change retention on the protected copy.
- Test recovery. Restore representative files, a database, a server, and a complete application into an isolated environment. Measure RPO and RTO.
- Test the worst case. Rebuild the backup console or repository from protected configuration and keys, then recover using only emergency procedures.
- Document and repeat. Assign owners, schedule verification and restore drills, and review results after infrastructure or policy changes.
Ransomware recovery runbook
When encryption is suspected, avoid destroying evidence or allowing the attacker to reach remaining copies.
- Isolate affected endpoints and servers from the network according to the incident-response plan.
- Disable suspected accounts and revoke exposed tokens, but do not delete backup data or shorten retention.
- Protect offline media and immutable repositories from any newly compromised management system.
- Identify the infection window and choose a restore point created before that window, using multiple sources of evidence.
- Rebuild identity, network, and security foundations in a clean or isolated environment.
- Restore the highest-priority services, scan and validate them, then reconnect users in stages.
- Preserve logs and document which copies, versions, and procedures succeeded or failed.
Common buying mistakes and fixes
- Mistake: treating a synced folder as a backup. Synchronization can replicate encryption and deletion. Use versioned, retention-locked backups instead.
- Mistake: leaving an external disk connected. Disconnect it after the job and rotate at least two encrypted media sets.
- Mistake: putting backup administrators in the same privileged group as production administrators. Separate roles and require MFA.
- Mistake: retaining only the newest copy. Keep historical points long enough to outlast delayed detection.
- Mistake: trusting a green job status. Verify that files open, machines boot, applications are consistent, and operators can complete a restore.
- Mistake: ignoring configuration and keys. Protect catalogs, encryption metadata, certificates, and runbooks alongside user data.
- Mistake: comparing license prices only. Include storage growth, retention, support, recovery capacity, egress, and staff time.
What to verify before signing a contract
Ask for written answers that apply to the exact edition and hosting arrangement you will deploy:
- Which workloads and operating systems are included?
- Which repository types support immutable retention, and who can override it?
- How are encryption keys generated, stored, rotated, and recovered?
- What MFA, role, audit, and alert controls are available?
- How are deleted jobs, compromised credentials, and lost catalogs handled?
- What restore-verification features are included, and can tests run in an isolated network?
- What are the storage, retrieval, egress, support, and emergency-recovery charges?
- Can you export data and configuration if the service or hardware must be replaced?
The National Cyber Security Centre’s ransomware-resistant backup guidance, published and reviewed on 22 November 2024, reinforces the need to design backups for attack resistance rather than merely for routine file recovery.
Bottom-line selection criteria
Choose the software and storage combination that demonstrably provides immutable retention, an offline or independently isolated copy, encryption with separated keys, point-in-time recovery, least-privilege administration, broad workload coverage, and automated plus human restore testing. If a candidate cannot show who can delete backups, how long locks last, how credentials are separated, and how a clean restore is proven, it is not yet a ransomware-protection solution—regardless of its feature list.
Quick Recap
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