Delta Drive, Delta Trust & My Drive · Delta Trust backups
Should I back up to Delta Trust or Delta Drive?
Short answer: Choose Delta Trust if you can only have one: nothing on your Mac can remove its backups. Use Delta Drive as a convenient second copy that you can see and manage — and therefore delete.
If you only have room for one, choose Delta Trust. It's the only one where nothing on your Mac can remove what's already been backed up, which is what protects you from ransomware, a compromised Mac, or a slip of the finger.
Delta Drive is the convenient place for a second copy: you can see the backup folder alongside your files and manage it yourself — which also means it can be deleted.
Related: ransomware protection and backups in general.