I regularly backup my iPhone and iPad devices to my Mac and for many years have been doing an encrypted backup. Based on reading elsewhere like answer here and the comments I'm going to assume I did not select save backup password in Keychain originally way back when. I search in my Keychain and find no items matching "Backup" etc. How is it that I can plug in the iOS device and make new encrypted backups without entering a backup password?
The only entries I'm finding in keychain related to my iOS devices is one for each device name of type
RPIdentity-SameAccountDevice. I don't know what these are for and my user password doesn't seem to unlock these keychain items.
Background: yep yep, I seem to have lost my iPad encrypted backup password. I didn't forget it, because I never knew it. I use a password manager. I have a iPhone backup password saved that works on my iPhone backup, but that password, nor anything else I can think of is working to unlock my iPad backup. :-/ I backed up this iPad without issue right before erasing it to do a little testing with a different account.