Some things could be improved, though: I get it that system files and directories will not be backed up. CrashPlan, because I haven't tried them, but I love it: fast, easy, fair price, works great on El Capitan, satisfying so far. I can't compare it to other similar services, e.g. I made the Sparse Bundle directly inside Apple's provided Disk Utility set to maximum encryption. Meanwhile, I have it set to open up and ask for its password each time I boot my Macs. They can't get into my Sparse Bundle Disk Image, period. I back it up and mirror it via Drop Box and don't have to care if government surveillance maniacs are on the loose busily destroying The Fourth Amendment. Because it is a 'bundle', only pieces of the 'bundle' are updated as it changes, versus the entire disk image. The encryption dilemma: I have a password protected, encrypted Sparse Bundle Disk Image I use for storing my private data. Otherwise, I've had very good success with Box. Box is kind of annoying in that you are stuck using Windows naming characters and they can lose track of which Mac in a mirrored pair is the primary versus secondary. SpiderOak and Arq have good reputations and are both Mac friendly. My experience with Backblaze was that they were incompetent and didn't care to discuss the matter.

Blaze backup mac