Remember to delete history!!

I woke up today to get back to work on the Land Rover, fired up Maya and tried to load my project file. It said loaded but was stuck at ‘reading’ on 99%. I eventually managed to open it, but the geometry was all over the shop. Turns out I hadn’t deleted the history as recently as I had thought. I had to go back through quite a few incremental saves to get to a file I could actually open. I had had autosave working, but none of the files it gave me worked, unfortunately.
So, as a result, I have lost almost an entire weekend of work as I have to now go back and redo everything, although now quicker as I know what I was constructing!