I do not see the backup now option on my iPhone

I had started using this phone which belonged to my mom. I did not sign out from her clould till February when I did I lost all my photos and data etc and I made myself an Apple ID but when I did I realized that I lost all my files I logged back in with my moms Apple ID now I’m trying to recover my files from clould and I can’t see a restored button I don’t know what to do and I need my files back as there are important stuff in there.