iPhone backup to macbook
Have backed up iPhone 7 32gb to MacBook Pro, did not enter password. Now want to encrypt a new backup, am asked for old password in order to set new password. I did not set nor have knowledge of old password. Tried iPhone passcode, and apple id password to no avail. Tried to do unencrypted backup, and it will not let me without old password. I can reset the iPhone back to default, but am uncertain what may be lost. Ideas on how to proceed?
iPhone 7