That's a great idea, thank you.(I also had the same issue happen) I found it's a good idea is to make semi-regular back ups of your "C:\Users\--?--\AppData\Roaming\RenPy" folder...it's where Ren'Py stores all your played game saves.
Also, for me it that folder size so far exceeded 5.5gigs of saves...so I also installed a sata drive along my ssd drive, as an ssd drive life span isn't as reliable as a sata hard disk...(speed vs reliability...it's good to have a mix of both, C=SSD, D-Z= sata storage drive), or just use a USB stick to back up saves.