Add logins _ All PWs lost

I don’t know why or how but I went to open AP and was met by all of my passwords/logins details having been scrubbed. AP asked me as if I were a 1st time user setting it up. I’ve essentially lost 4 years worth of passwords and am unsure of how to access/retrieve them. I think it was syncing/backing up to somewhere. I just never thought this would happen.