I have 2 Mac's in the house. It took 3 months but I finally resolved the backup problem with one of them. Now the other one refuses to back up. I've gone thru their directions, and it backed up on time in a month. They want to have a remote session where they will take control of my computer--I don't think so. Requested a partial refund, got an emphatic no, we don't do that. Unfortunately I'm just going to have to bit the bullet and totally get rid of this so called back up. It just doesn't like and IOS operating system. Just get an external drive and use Time Machine, it does the same thing. And if you want a cloud based back up, use ICloud--you know that will work with a MAC.