If you are using Backblaze for your online backup needs - make sure that you routinely go to their website and use their restore tool and compare it with your original data to make sure your data is actually being backed up. Just recently my backup got corrupted for the second time in about a year and they've lost my backup completely and I've got to start all over again. So for the next month of two - I will be re-uploading tons of data just to get to where I should have been all along. This will leave me completely unprotected in the event that I lose my local backup. A pretty scary thought.
The most infuriating thing about this is that there is no easy way to track the progress of Backblaze's backup. They make it extremely hard to know what is really going on and how far are you on the way to being fully backed up. They follow Apple design sensibility (think Time Machine) and build software that is very opaque. You are just supposed to trust that it works. And you get that false sense until you look under the covers and realize that it wasn't. Hopefully by then it isn't too late.
The only way to know is this extremely unscientific method of visually comparing what is available on their 'Restore' page on their website with what is on your hard disk. You can probably compare some top-level folders but you cannot be fully certain. It is quite a bummer that a backup service cannot tell you the true state of your backup.
So the state of online backup for folks with large data sets (over 1TB) stays dismal as ever.
On the plus side - their customer service is very good. They are very responsive and they generally mean well. Unfortunately their technology just isn't there or they don't have the bandwidth to support their requirements. I wish they'd spend less time and resources publishing hard disk analysis than actually building better software. But that will probably not help making them a more attractive acquisition target.
Yes, I have a crashplan backup as well but that has its own set of issues - it is slow and crashes a lot - but certainly makes it far easier to know where you are in terms of being backed up.