Rollback feature

[clee604]

Not sure if this already existed as I see in the upgrade script it copies some backup folders but could we incorporate a way to roll back to the previous version(s).

Now that I have the V2 in a good place, I'm hesitant to upgrade, but I really want to.... this feature would allow me to go back a version if I run into issues easily without having to manually backing up the card and redeploying it.