I can tell you, that using Timeshift GUI is really really userfriendly atleast on a EXT4 Filesystem with RSync. It tells you exactly what is going to replaced, all the Partitions that will replaced with a good overview (like boot,swap,root) (even home if you manually added it in the rules, but per default it is skipped, so its not get mirrored/restored) and you just press a few times okay, to accept everything, then comes the filecheck window and after that the last agree and its going automatic in tty for you and you just lean back and be surprised how relieable timeshift really is.
It love this GUI and its total userfriendly. But i heard bad stuff about BTRFS and BTRFS Snapshots… but rsync should be fine (at least that what i heard), so my own experience going only around ext4+rsync.
Here some good points from me, how to update: