os Ventura - need to delete old Time Machine backups
I have an external drive, one of those small Passport drives. I've had it several years and have many backups from older computers.
My drive is getting full and now new backups fail because there isn't enough room.
I've tried using TimeMachine to delete a folder/backup but there is no option to do so once I select a date.
I've tried manually deleting a folder in the Finder, but it won't let me because it's protected. Even if I unlock it, it won't delete.
How can I free up space on my external disk by removing some of these old backups?