Mount a remote filesystem over SSH

• Install SSHFS.
• Add something like the following to the /etc/fstab file. (Here, you can put more specific path after the colon in the first term.)

  de1682@de1682.rsync.net:foo /mnt/rsync  fuse.sshfs noauto,x-systemd.automount,_netdev,IdentityFile=/root/.ssh/id_ed25519,allow_other,reconnect 0 0
  

• Restart the computer.

If you aren’t able to use this as a datastore in Proxmox Backup Server, try this (as per this):

• Create a local datastore.
• Copy over its contents to the SSHFS-ed directory.
• Modify /etc/proxmox-backup/datastore.cfg to point the datastore to the new directory.

Resources:

• https://linuxize.com/post/how-to-use-sshfs-to-mount-remote-directories-over-ssh/