Hello!
I have a similar concern regarding cloud storage and OC storage. After investing several hours in Mass Effect 1 legendary edition. I exited the game after saving my progress, then left for some time. I logged back into steam and EA and loaded the game. The prompt window popped up, stating a discrepancy between the cloud storage and the one on my HD. I chose the one that was more up-to-date (the cloud). After loading the game, I discovered the cloud save was nowhere close to where I left off...it was at the beginning of my gaming session of that day (6 hours or so). I panicked and looked through the HD logs (the same pathways you have outlined to others). Every save file was changed to the time and date I logged back into the game. It appears every saved file has now been changed to the new one. Is there any way to recover my previous files? I cannot find them through the means you have shared here and in other threads.