Select and remove previous backup files

My 2T WD MyPassPort Ultra is nearly full with regular backups from my laptop. How do I selectively remove old backups to create more space?

I’m having the same problem! I have a WD My Passport Ultra portable external hard drive. I have a “back up” folder containing my old backup files from my previous office computer. Now I’m trying to create more space on the drive, and I’m not able to delete the earliest folders from the Backups.backupdb folder. How can I remove some of these old folders to create more space?