I have the 2020 .dat backed up in multipe locations so not to worried about anything happening this copy of a backup.
I am now wondering can i just make a new backup of the wallet from core 27.1.0 and that will be it sorted.
Thanks
I think it shouldn't be a problem make sure to also make a new backup wallet from the latest version just make sure you have these two backup just incase in the future you experience some issues you need the old and new backup for recovery.