Quite a lot in there.
Couple of related feature requests:
autosave maximum
https://forum.cockos.com/project.php?issueid=3646
Project Backup Files (Limit)
https://forum.cockos.com/showthread.php?t=199379
And some discussion and ideas:
WTF? I just deleted 100GB of backup files from the secondary dir alone!
https://forum.cockos.com/showthread.php?t=138199