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  • Create a single LUKS container in a file stored on the backup storage.
  • Mount the backup storage on your local VPS via SSHFS.
  • Use Linux cryptsetup to access the encrypted contained on your VPS.
  • Mount a filesystem created inside it locally and rsync your backup data to it.

Preliminary setup

On a Debian-like system, install the following packages:

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Note that it is probably convenient to have an SSH key without passphrase to automate things.

Creating the LUKS container

All paths below are matching the backup script and user root is assumed, adapt to your needs.

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Code Block
languagebash
titleClose the LUKS container
umount /mnt/backup-crypt
cryptsetup close backup
fusermount -u /mnt/backup-soleus

Resizing the LUKS container

If you find that the LUKS container has too little space to contain your backups, it can fairly easily be resized. First mount the backup space, then extend the LUKS file, run the resize command for the LUKS container, and then for the FS inside it:

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This increases the backup container by 10GB.

Running backups

After this setup, the shell script below should allow you to make backups. Of course the precise way and what to backup can be adapted in the backup_run() function. You can for example create LVM snapshots of your logical volumes and backup these to guarantee a consistent state, or use hardlinks to keep full backups from multiple dates with little overhead, à la rsnapshot. I am doing both these things; feel free to contact me for more details.

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