I previously (2015) made a Super Duper backup of my iMac that I’m trying to access. At that time, my login password was the same as my iCloud one. I started using 1Password later that year, and changed all of my passwords. Is there anyway to recover that old password?
Are you looking for the password itself or trying to get at the data on the backup?
If you had the original password in 1Password you should be able to look it up there. If the password was in there and then changed, go to that entry and there should be a “View Password History” box near the bottom.