I'm used to working like I was taught in my 3d animation days.. save often, and dont save over...
So I would save after i got a certain part of the song done.. I would save with my music in midi format, then convert to audio and save another version.. I would do this in different stages of the song so I can quickly go back to a certain part and re-work from ther if needed, and i will have midi AND audio versions to choose to work from/with..dfegad