Roll 20 saves as one works so at anytime if the browser is closed or PC is turned off, everything is as it was when user left. I was thinking the ability to make a specific save instance so to reset campaigns.
E.G.
Finish working on everything to start a campaign. Make the "hard save". Run through the campaign with players. After it's done and dusted, maybe 2 months later you have a different group of players and you want to run them through that campaign. You can go to the campaign and reset it back to how it was before you ran through it with the first group.