Add UI for managing database snapshots

What is the feature you'd like to have?
A user requested a "save with backup" option today because of bad experiences they've had with tools like IDA in the past corrupting on save and losing work. Having an option for automatic backups on save is a good idea for people who are paranoid about losing work (and also shouldn't be too tedious for most binaries now that we've done our performance improvements for database load/save).

Is your feature request related to a problem?
It's theoretically possible that, on save, a database could be corrupted. Recovering from this should be fairly easy, but depending on the nature of the corruption, could be incredibly difficult.

Are any alternative solutions acceptable?
Having a backup copy automatically saved that you could return to is the way other tools like IDA handle this problem. There are probably alternatives that are acceptable, but I believe they'd be more work than simply doing this.