This is your annual reminder to do a snapshot (timeshift or whatever you prefer) before doing relatively minor changes to your system.
I was supposed to be in bed now, but instead I am stuck troubleshooting xorg refusing to start after an apt-get dist-upgrade.
And as far as friendly reminders go, I should've given myself an unfriendly reminder beforehand, as it's not the first time....
UPDATE: Fuck nvidia 545. All my homies hate nvidia 545. 535 4 lyf!
As long as your file system is on BTRFS, timeshift is, I O, the easiest backup app for Linux, specially if you're just getting your feet wet in it.