Time Machine backup not portable is the exact reason why I ditched it in favour of CCC. Difficult to set up incremental backups but at least their backup is portable, meaning I can replace drives without losing history backups. Apple is a master of disappointing people really.I've already run into a Time Machine issue on USB drives as I wanted to copy an old USB drive backup to a new, larger drive to continue using it, but as the original drive was formatted in HFS+, there is no way to format the new drive in HFS+ (encrypted) anymore and you can't convert an HFS+ backup to APFS... Pretty shoddy of Apple not to have a solution for this - just expected to start again and hope I don't need files from 5-10 years ago (or that the original drive doesn't break!)