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Use Linux snapshots for fast rollback, but put a second copy on separate hardware for backup protection. On Btrfs, create read-only snapshots of the subvolumes you need, then transfer them with btrfs send to another mounted Btrfs filesystem with btrfs receive. Keep the receiving destination protected while the transfer runs, and test that you can restore files before relying on the system.
What snapshots can—and cannot—protect
A Btrfs snapshot is a subvolume whose blocks are initially shared with the original through copy-on-write. Later changes are written to new blocks, so a snapshot can return a system to an earlier state quickly. Snapper can make read-only snapshots, compare them, and pair a pre-change snapshot with a post-change snapshot around package operations.
The Btrfs documentation states: “A snapshot is not a backup: snapshots work by use of BTRFS’ copy-on-write behaviour.” Snapshots stored on the same filesystem can share the very blocks damaged by a failing disk or corrupted filesystem. Theft, ransomware, or an accidental deletion that reaches every retained copy can also remove your recovery path.
Use two layers:
- Local snapshots: quick rollback after an update, configuration mistake, or unwanted file change.
- Separate-device copies: recovery when the source disk or whole computer is unavailable.
A reliable external USB storage device, such as a USB NVMe drive, is a practical destination. Match its capacity to the subvolumes and retention policy you actually intend to keep; no single capacity or retention period is universal.
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Check your Btrfs layout before choosing a tool
- Confirm which mounted filesystems use Btrfs:
findmnt -t btrfs - List the subvolumes visible from the root mount:
sudo btrfs subvolume list / - Identify which subvolumes contain the operating system, home directories, and services. Boot or EFI partitions are often separate filesystems and need their own recovery plan.
- Check your distribution’s documentation before adopting a layout from another distribution. Timeshift’s Btrfs mode expects a particular subvolume arrangement and is not automatically portable between distributions.
Snapshot only subvolumes designed for snapshotting. Databases, virtual machines, and other actively changing services may require an application-level export or a coordinated shutdown in addition to a filesystem snapshot if you need a consistent restore.
Choose Snapper, Timeshift, or native Btrfs commands
| Need | Snapper | Timeshift | Native Btrfs |
|---|---|---|---|
| Rollback speed | Fast local rollback from read-only snapshots | Guided system-restore workflow | Direct control over snapshot subvolumes |
| Policies and retention | Configurable timeline, cleanup, and pre/post policies | Schedules and exclusions through its interface | You define naming, retention, and cleanup |
| Change comparison | Built-in listing, status, and diff operations | Primarily focused on creating and restoring system snapshots | Use Btrfs inspection tools; no Snapper policy layer |
| Distribution/layout compatibility | Depends on how its configuration maps to your subvolume | Btrfs mode has layout constraints; rsync mode has different behavior | Works at the filesystem level, but you must understand your layout |
| Off-device replication | Pair its snapshots with btrfs send |
Use its archive workflow or export Btrfs snapshots separately | btrfs send/btrfs receive are the most direct option |
| Home and service data | Snapshot each required subvolume and handle services separately | Configure included paths and exclusions carefully | You select exactly which subvolumes to transfer |
When Snapper is the better fit
Use Snapper when you administer a Btrfs system and want policy-driven timelines, cleanup, comparisons, and pre/post snapshots around package changes. Configure each target subvolume explicitly rather than assuming a configuration named root covers /home or service data.
When Timeshift is the better fit
Timeshift is aimed at a simpler system-restore experience. It supports Btrfs and rsync modes, schedules, exclusions, and guided restoration. Its Btrfs mode is layout-sensitive, so verify that your distribution’s root and home subvolumes match the arrangement Timeshift expects. An rsync snapshot is not the same thing as a Btrfs snapshot and should be evaluated separately for space, speed, and restore behavior.
When native commands are the better fit
Use native Btrfs commands when you need explicit control over subvolumes, full versus incremental streams, and the external destination. This is the clearest workflow for maintaining an off-device copy of read-only snapshots.
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Create a local read-only snapshot
With native Btrfs
Replace the example paths with the mounted source subvolume and a destination directory on the same Btrfs filesystem:
sudo btrfs subvolume snapshot -r /source/subvolume /source/snapshots/root-before-changeThe -r option makes the snapshot read-only. Use a descriptive name containing the purpose or change being protected. Repeat the operation for other subvolumes that must be recoverable; a root snapshot alone does not automatically include a separate /home subvolume.
With Snapper pre/post snapshots
After creating and configuring a Snapper configuration for the target subvolume, create a pre-change snapshot and record its number:
sudo snapper -c root create --type pre --description "before package upgrade"Run the package or configuration change, then create the matching post snapshot using the recorded pre-snapshot number:
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sudo snapper -c root create --type post --pre-number <pre-number> --description "after package upgrade"Use snapper list to review snapshots and the appropriate Snapper status or diff commands to inspect what changed. The configuration name and target path are distribution-dependent.
With Timeshift
Open Timeshift, select the Btrfs or rsync mode appropriate to your layout, choose the snapshot device, set schedules and exclusions, and create a snapshot. Review the included paths before accepting the job. From a terminal, sudo timeshift --list lists available snapshots; sudo timeshift --restore starts its guided restore flow after you have selected the snapshot and target.
Control local snapshot space
Snapshots initially share extents, but every changed or deleted file can require new storage. A large snapshot count can therefore consume the free space of the source filesystem even though each snapshot starts small.
- Choose a retention policy that fits the free space available.
- Inspect usage periodically, for example with
sudo btrfs filesystem usage /. - Delete old snapshots deliberately through the tool that created them, and keep the snapshots needed for your export chain.
- Do not treat free space reclaimed by deleting a snapshot as evidence that an off-device backup exists.
Send a snapshot to an external Btrfs drive
btrfs send creates a stream and btrfs receive reconstructs the subvolume on another filesystem. The external destination must be mounted, and every snapshot participating in a send must be read-only.
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1. Prepare and protect the destination
- Format or select a separate Btrfs filesystem on the external drive according to your normal storage policy, then mount it at a known path such as
/mnt/linux-backup. - Create a receive directory on that filesystem and restrict write access to administrators.
- Keep the destination unmounted or disconnected when it is not being used if practical. During a receive operation, do not allow unrelated processes to modify the receive path.
2. Perform the initial full transfer
Send the read-only source snapshot to the mounted destination:
sudo btrfs send /source/snapshots/root-before-change | sudo btrfs receive /mnt/linux-backupThis full send transfers a complete representation of that snapshot. Use a destination path that is on the mounted external filesystem, not a directory on the source disk.
3. Send later changes incrementally
After creating a newer read-only snapshot, use the previously transferred snapshot as the common parent:
sudo btrfs send -p /source/snapshots/root-before-change /source/snapshots/root-after-change | sudo btrfs receive /mnt/linux-backupThe parent snapshot must be available as the matching snapshot in the send relationship, and the destination must already contain the parent received by an earlier send. If the relationship is missing or a snapshot was changed to read-write, the incremental send cannot be used; perform a new full send instead.
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4. Repeat for other required subvolumes
Send separate snapshots for /home, service data, or other subvolumes you decided to protect. Preserve the names and parent relationships so future incremental streams remain understandable.
Verify that the copy can be recovered
- List subvolumes on the external filesystem:
sudo btrfs subvolume list /mnt/linux-backup - Check that the expected received snapshot names are present and that the receive operation ended without an error.
- Mount a test snapshot read-only using the external device and its subvolume name, then open representative documents and configuration files.
- For a system recovery drill, boot live media, mount the external filesystem, and practice restoring to a test target rather than experimenting on the only installed system.
- Document which snapshots cover root, home, databases, virtual machines, and boot or EFI data, because each may have a different restore procedure.
Recovery and safety decisions
Keep more than one recovery point
A single recent snapshot is vulnerable to an unnoticed corruption or a mistake that is discovered late. Retain a sequence that matches how often your system changes and how much space your source and destination can hold.
Separate rollback from disaster recovery
Use a local snapshot for a quick undo, then use the external received copy when the source disk, computer, or filesystem cannot be trusted. Do not mount the only external copy read-write for routine work.
Plan for data that snapshots do not cover
EFI or boot partitions, encrypted-volume metadata, application exports, and service-specific consistency requirements may sit outside the snapshot subvolume. Record those items and back them up through their own supported method.
Quick Recap
Common failure modes
- “The snapshot disappeared when the disk failed.” A same-disk snapshot shares the source device; use a separate receive target.
- “The incremental send is rejected.” Confirm that the parent was transferred, the source snapshots are read-only, and the source and destination refer to the same send relationship.
- “The restore does not contain my files.” Check whether home or service data is a separate subvolume or was excluded by Timeshift.
- “The backup drive filled up.” Review changed data, retained snapshots, and incremental history; remove old copies only after confirming that the remaining chain and required recovery points are intact.
- “A different distribution cannot use this Timeshift snapshot.” Btrfs layout assumptions differ. Treat Timeshift Btrfs snapshots as layout-specific and verify compatibility before migration.
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