1. Do you use both Powersaves and Powerplay? Save backups are stored in different folders, the file location is usually something like C:\\User\Documents\Powersaves or C:\\User\Documents\Powerplay. Check if there's any .bin files in there, those are your backups.
2. Also using Powersaves you can't use another persons save file as each game card has a unique encryption between the cart and the save, if you want to insert a save using homebrew I'd be happy to give you a modified version of my Omega Ruby or X save (The actual version the save file came from doesn't matter if it's from ORAS for ORAS or XY for XY)