Comment 9 for bug 453169

Dan, adding mount/umount does not solve the problem for sshfs, only for SMB, NFS and the like. The problem is, sshfs works over the SFTP protocol, which lacks support for hard links. This means that the whole hard-link magic fails when you use sshfs. So screw sshfs, use a real filesystem, you say? Not so fast: ssh is a great tool, and makes it really easy to set up secure backup “in the cloud” as they say.

No problem with using mount/umount for restore operations (that works), but backintime needs to support rsync directly over ssh (no mounting needed) in order to be useful in this setup.