Autosave versioning/session project numbering

Just lost a couple hours of progress on this thing because I worked on two new sessions in the same day and accidentally saved the second one over the first one (both were called the default name, today's date). By the time I noticed, the autosave had already replaced the first session and I was out of luck. Overwriting sessions should be a lot more difficult than it is. Additionally, the risk could be significantly reduced if distinct sessions started from "new" would be tagged by time in addition to date.

The session files are pretty compact, it would be great to have an option to retain x number of autosaves instead of just being stuck with the most recent one.