I have not used: 1. voice and video
Incredible that SMS costs so much. I wonder if it's worth it because it _saves_ so much in spam and other sorts of fraud or bad behavior?
Directory integration, as in, importing a vcard with everyone's phone number into your device such that you can tap on anyone's name and message them on Signal if they've got Signal installed?
Fair warning: It will...bloat. It usually keeps 3-4 copies of most recent backups in the folders you select and if you send a lot of photos, imagine it eating tens of gigabytes of storage just for backup.
(My current backups are 9.75 gigs each, approx 3 of them)