You're confusing "they don't do that" with "they can't do that". Their terms of service appears to specifically allow this: You agree to grant AgileBits, Inc.

You're confusing "they don't do that" with "they can't do that". Their terms of service appears to specifically allow this: You agree to grant AgileBits, Inc. a license to store, retrieve, backup, restore, and otherwise copy Your Data so that we may provide you with the Service.