Just found this thread, and read a lot of discussion, so thought I'd mention a few things native to mine own experiences/usages.
I just dropped
CrashPlan - it didn't work, when push came to shove. Am also abandoning
Acronis True Image Pro - local, not the online version - for the same reason. Went through - still going through, in fact - much the same problem
mouser had. Neither
Acronis nor
CrashPlan would allow me to restore an image to a kinda, sorta remote drive. If the drive was not mounted as primary, image could not be restored. That makes them both useless, in my [not the slightest bit humble

] opinion.
There are two (2) kinds of backup. One (1) is data, the other is system. Data backup is pretty simple, just needs doing - or automating, and there are a plethora of ways to do that. System backup is a different matter. If it cannot restore to a [currently] non-OS-primary drive, it's useless, no matter how often you backup. And since system image will change over time, that restoration is the only viable alternative to an OS re-installation.
I've been fighting this problem/opportunity on PCs since 1985, give or take a year or two (2), and have yet to find anything truly functional. There is nothing extant on the market that will perform adequately for PCs. Oh, you might see one (1) or two (2) successes, but in the long term, this is a failure/failed venue.
Now, cloud storage for data might seem a good thing, and I suppose it is useful, but what is its worth if you can't get online? What if the files you need to access the cloud are
on the cloud?
For non-image backups, I keep one (1) 2T external in the truck, one (1) at a neighbor's house, one (1) at a friend's place, as well as a couple here, one (1) in the garage, one (1) in the computer room. (Can ya tell I'm kinda
belt & suspenders 
?). Obviously, these are not all updated at the same time - a near logistical impossibility - but the local ones are updated weekly, and the off-site ones are updated monthly. It was an expensive start - five (5) 2T drives were not cheap, e$pecially when I started

- but, barring disk image [software] failures, as previously noted, this system has saved my butt more than once. (And a coupla times when I didn't have Internet access

.)
I truly believe that, regardless the claims of the various software applications that target this arena, each of us has to create our own backup scenario, insuring that the data that is important to each of us is duplicable and recoverable. Then it is our responsibility to insure that adequate methodology and media is available for the purpose, and
that we use it.
[Edit: typos & plurality]