Save Versioning

[levifig]

One thing I'd love to see implemented in MultiMC is the ability to take a snapshot/version of a specific save and have the ability to restore to it. I don't think automatic versioning is needed but having the ability to right-click an instance, and have a "Backup..." context menu with a sub-menu with the list of worlds would be nice! Restores could be done from within the "manage saves" interface, with each save having a dropdown of all the versions (with the timestamp). :)

Please? :) 💯