I'm trying to backup my files to an external hard drive connected to another computer on the network. I installed sshfs in order to make the drive visible to applications performing as root (like MintBackup). However, when I try to backup the files, I get "Permission denied". I've checked the permissions a zillion times. MintBackup has permission to write. How do I complete my backup? As of right now, my laptop has NO way to backup files because of this!
Have you tried another backup program? I use luckybackup, which is essentially a fancy front-end for rsync. You could always craft a beautiful rsync script for yourself and run that every time you get paranoid about data loss.
Failing that (or you really want to use mint's backup), is there a specific error you could copy/paste for us to investigate?
It isn't fancy but unless you absolutely need to retain old backups (I don't) you can just keep it mirrored like so. Just mount the network share to your laptop. I have a pair of these type scripts running every 30 minutes via cron. Backing up home to 2 separate usb flash drives.