Delta Drive, Delta Trust & My Drive · What Delta X is
Why are Delta Trust and Delta Drive kept separate?
Short answer: Backups must be impossible to delete while working files must be easy to change, so Storage Studio keeps them in two halves with different protections. Changing your working drive never moves your backups.
Because backups and working files need opposite rules. A working drive has to let you delete and overwrite things; a backup is only worth having if nothing — including a mistake or ransomware on your Mac — can delete or overwrite it.
So Delta Trust and Delta Drive are two halves with different protections. Delta Trust also stays where it is when you change working drives: switching from Delta Drive to My Drive never moves or touches your backups, and a working drive is never treated as a substitute for them.