Quick general tip: Backup up ~/.config, that way you can restore configuration for all your programs in case anything bad happens.
Ah wait, no, even more general tip: Back up everything except for the stuff you don’t need (cache and such), but if in doubt, back up.
Oh and while I am at it: Restore the backup, regardless of whether you need it already. Unless you have tested that you can restore, you don’t have a backup.