Added FAQ section about backing up root partition
Added FAQ section about backing up root partition

Using borgbackup to backup the root partition works fine, just
remember to exclude non-essential directories.

Signed-off-by: Fredrik Mikker <f487c7598f046a9a67757788cf85ee89028a1b14@mikker.se>

edgimar/borg,raxenak/borg,raxenak/borg,edgewood/borg,RonnyPfannschmidt/borg,edgewood/borg,raxenak/borg,edgimar/borg,RonnyPfannschmidt/borg,edgimar/borg,RonnyPfannschmidt/borg,edgewood/borg,edgimar/borg,RonnyPfannschmidt/borg,RonnyPfannschmidt/borg,edgewood/borg,raxenak/borg