I will be returning from a month-long vacation next week. Let’s see if my arch machine will break completely!
I’ve had no problems, as long as I’ve updated the keyring first sudo pacman-key —refresh-keys. I’ve probably gone a few times not upgrading my system for a while and I had minimal problems.
Firefly III. If you're in Eŭropo, I believe it can sync with most banks too.