Hello Alimagoo,
Sorry about the misinformation, iDrive does not support “Entire System Backup” on a Mac. You can get software from EaseUS that will make a System image and back it up to an external Hard Disk Drive. At this point, you can use iDrive to back up the system image from your External Hard Drive.
I hope that helps!
Apple Devices > backed up to iTunes > system > System image on External > iDrive cloud.