Delta Drive, Delta Trust & My Drive · Delta Trust backups
What happens when I turn off the Delta Trust second copy, and what does it cost?
Short answer: Turning the second copy off stops the charge and new writes but keeps what's there; deleting it is a separate step. While on, you pay for the space the second copy actually uses, not a flat fee.
Turning the second copy off stops the charge and stops new writes, but it does not delete what's already there. Removing a second copy is a separate, deliberate step, so an accidental switch can never destroy the only other copy of your backup.
While it's on, you pay for the space the second copy actually holds rather than a flat fee — storing the same bytes twice costs twice. Current pricing is on the pricing page, and your own charges are in Settings → License.