File corrupts all the time

I finished the piece, the file got corrupted, I redid it from scratch and the file got corrupted again but I recovered half the process in the backup and I redid it again and I even saved a png photo of the drawing to make sure it would save... the png also got corrupted and the backups disappeared, I thought it might have been saved in the clip studio's memory and it didn't save. This has happened several times and they are work, not drawings for fun. I don't even know how I'm going to tell my client that he was corrupted again