Restore Prior Save?

I'm aware that MSE overwrites project saves, but I really need some help. I've been developing a set that is very planeswalker-heavy, and I set a planeswalker to "one ability" without thinking to check the "Options Specific to this Card" box. Apparently, this box wasn't checked on many of my planeswalkers, and as a consequence, many of them have lost the rules text to their loyalty abilities. I don't remember what most of these abilities were.

Egg on my face for not making backups. Is there any easy way out of this mess?