Comment 8 for bug 1202363

It does not work on FAT as well.

My situation -- backup of home directory to a vfat mount. It creates a backup file duplicity-full-...difftar.gz, but later it apparently wants to change its permissions which is nonsense on FAT mount. Duplicity should not set (or at least rely on success) permissions of backup files explicitly.

As a user running duplicity I have full permissions to the backup file (i.e. 0666), but I am not the owner of the file and cannot be so. The FAT partition is mounted that the owner of all files is a particular user (root in my case). I cannot change it to a different user (me), because other users would have the same problem making backups to the mount.