Premiere Rush Crashed- lost 3 days of work despite saving daily?

Newbie here.   Was working on an hour long webinar for the past few days.  Each night I was rendering and saving a document just in case it crashed.   Saving on my laptop hard drive- using Windows 10.

Finished and couldn't export.  Kept giving me keyframe errors.  My cloud files are empty- no autosaved versions, despite having the cloud turned on.  

I have a December 8th file- that's it.  but if I redo the editing, I am afraid the same issue will recur.  

Where could these documents that I thought I'd been saving go to?

I tried deleting my media cache as the system memory was another error that popped up.  but I don't know where to go to from here.