I have switched from using BorgBackup to using Restic. At the moment old Borg backups are still kept on the Hetzner Storage Share and are mirrored to my home network. The newer Restic backups are on the Hetzner Storage Share as well, but they are mirrored to Backblaze.

Procedure

The whole backup is under /opt/backup. If it is feasible, Btrfs snapshots should be used to back up files to /opt/backup/snapshots.