Roll20 Backups

Does anyone know how the backup system tied to pro membership works? To be specific does roll20 take backups for all campaigns but they're only accessible by pro users, or are the backups only taken by campaigns of people with pro users in them? Some stuff got deleted from my campaign recently and it would be far easier to upgrade to pro to do a rollback, than recreate it, if that's even possible. 

So I as I didn't get a response, I decided to test it myself, and it seems like the backups are taken of all games not just pro games, so if anyone has this problem you can simply upgrade to pro and roll it back. Just make a copy of the game before you do, in case you got unlucky like me, and the backup didn't fit the time-frame you need, so you want to set it back to present save.