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To copy files between two SSH servers without using your laptop as the data path, OpenSSH scp supports remote-to-remote transfer with -R. The source server then connects to the destination and must authenticate there without a password prompt. Avoid -3: that mode routes the file data through the local computer. For cloud storage, rclone may request a server-side copy, but only when the specific remotes support it.
Choose a transfer method based on where the bytes should travel
An encrypted connection is not necessarily a direct server-to-server copy. What matters is which machine runs the transfer and carries the file data. The laptop can stay out of the data path even when another server relays the bytes; that is different from a storage provider copying data internally.
| Situation | Suitable approach | What to check |
|---|---|---|
| Two SSH-accessible hosts | OpenSSH scp -R |
The source host must be able to reach the destination and authenticate to it without a password prompt. Check your installed OpenSSH scp(1) manual. |
| Interactive file browsing over SSH | SFTP | SFTP encrypts its SSH transport, but that alone does not establish that a transfer between two remote hosts avoids your laptop. Check the client’s behavior; see the OpenSSH sftp(1) manual. |
| Repeated synchronization, with one endpoint local to the process | rsync over SSH |
The rsync process must have a local endpoint. If it runs on your laptop, the laptop is involved; rsync does not itself support copying between two remote hosts. See the rsync(1) manual. |
| Cloud storage remotes | rclone copy |
Server-side copy depends on support from the specific remote backends. Otherwise, the machine running rclone downloads and uploads the data. See the rclone server-side copy documentation. |
| The two endpoints cannot connect to each other | A reachable intermediate server | The intermediate server carries the data. It keeps the laptop out only if the transfer process runs elsewhere. |
Copy between SSH servers with OpenSSH scp
For a remote-to-remote copy that avoids the local host as a relay, scp has a remote-execution mode: -R. In this mode, the client connects to the origin and executes the copy there. The origin therefore needs network access to the target and credentials that let it authenticate to the target without an interactive password prompt. The source account’s permissions and SSH configuration matter.
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1Repair Windows errors before they cause bigger problems2Scan for outdated or missing drivers - takes under a minute3Clear out junk files and repair common Windows errorsThe contrasting option is -3, which transfers remote-to-remote data through the local host. The OpenSSH manual describes this as the default mode, so do not assume that a command involving two remote paths automatically keeps the laptop out of the transfer. Confirm the behavior in the manual for the scp client actually installed on your machine.
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Prepare and test the route
- Confirm that both machines accept SSH connections and that the source host can reach the destination on the required network route.
- Set up and test the source host’s authentication to the destination. Do not copy a private key into a script or expose it in command output.
- Check the installed
scpmanual for-R, the client’s default behavior, and the path syntax supported by that version. - Try the transfer with a small, noncritical file and a destination directory where the account has write permission.
- Check the command’s exit status and confirm that the expected file arrived with the expected name and size. Keep the source until you have verified the destination.
Remote path syntax, host aliases, ports, wildcards, and shell quoting can vary, so a single command line is not guaranteed to work unchanged for every setup. The manual also notes that when using URI syntax for a remote-to-remote copy with -R, a port cannot be specified on the target. Consult the installed manual if you need a nondefault port or use a host alias configured for the source machine.
Use SFTP for interactive handling, not as proof of a direct transfer
SFTP is useful when you need to browse directories and manage files interactively. The OpenSSH sftp(1) manual describes it as performing operations over an encrypted SSH transport. Encryption protects the connection; it does not tell you whether a client relays file data through the laptop when both endpoints are remote. Confirm the behavior of your SFTP client before relying on it to meet a no-laptop-relay requirement.
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OpenSSH scp has used SFTP by default since OpenSSH 9.0, according to the scp manual’s history section. The manual also documents -O for selecting the legacy SCP protocol. Compatibility and behavior can depend on the installed client and the server, so check the local manual rather than assuming that all versions handle paths or remote copies identically.
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Understand rsync’s two-remote limitation
rsync is useful for synchronization over a remote shell such as SSH, and its delta-transfer approach can reduce the data sent when updating an existing destination. But the rsync manual explicitly says it “does not support copying files between two remote hosts.” It can transfer to or from a remote host when the other endpoint is local to the rsync process; remote transfers also require rsync on both machines.
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Here, “local” means local to the machine running rsync, not necessarily your laptop. If rsync runs on the laptop, its process handles the transfer. If it runs on a suitably placed server, that server may handle the data instead. Using SSH or an rsync daemon does not remove the two-remote limitation.
Use rclone for cloud remotes, but verify server-side support
For cloud storage, rclone copy can ask a storage service to copy data in place rather than downloading and re-uploading it. Rclone documents server-side copy for most, but not all, remotes; whether it works depends on the backend pair and configuration. Its documented behavior attempts server-side copy only when the remote names are the same. Check the relevant backend capabilities and inspect verbose logs rather than inferring that a cloud-to-cloud command stayed within the provider.
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If server-side copying is unsupported, rclone downloads and re-uploads the files through the machine running it. That can still keep your laptop out of the data path if rclone runs on another server, but that server needs adequate bandwidth. Rclone’s FAQ describes transfers between two remote cloud systems as effectively downloading and uploading the files.
Prefer copy when the source should remain intact. Rclone recommends its interactive option while you are learning the tool to help avoid accidental data loss. Treat operations that move or synchronize files with care: verify the destination before removing originals or allowing an operation to remove destination data.
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Verify the transfer before removing the source
- Confirm the transfer process ran on the intended host and that its route did not use the laptop as a relay.
- Check the command’s exit status, destination path, filenames, and file sizes.
- For important data, use an application-appropriate integrity check rather than treating a successful command exit as proof that every file is usable.
- Keep the source copy until the destination has been checked and any required verification has completed.
Tool documentation describes supported behavior, not your specific routes, permissions, installed versions, or cloud-backend combination. Test those parts in your own environment before relying on a transfer for critical data.
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