Animate crashes with no warning and corrupts all my files

I’ve been working on a piece of animation about a minute long for the past couple of months and a few days ago, it crashed and corrupted the file (error opening xyz). I managed to get it back with the WinRAR trick and decided to save a new version every time instead of overwriting the same file in the hope that it wouldn’t happen again. Now it’s crashed again and corrupted 10-12 previous versions (so I do have something salvageable at least) and I don’t know what the problem is. I need to fix it before something happens and I can’t get it back because hundreds of hours of work could be gone. If anyone can un-corrupt the file, it would be VERY much appreciated.