Only useful in some cases Pros: very fast, doesn't hog CPU or memory like CrashPlan Cons: deleted files are only retained for 30 days. Backblaze is essentially only useful in cases where a hard drive completely fails / external hard drive is physically broken. If a hard drive starts slowly corrupting over time, or if you accidentally delete files and don't realize it within the 30 day limit, you're screwed. Absolutely useless in those cases.

Black hole of customer service If I could give negatives stars (black hole perhaps) I would. I have been working over a week trying to get the software working since an upgrade of their software last week - and getting incomplete instructions or the same, non-solution solutions for something that probably needs tier 2 support. After 3 tries of reinstalling the software and trying to inherit my original account, I tried one last time. Only to discover that software limitations won't display more than 3 items so won't even display my original account to choose and so I am now DOA. Once again waiting for a couple of days to hear back from customer service. Unless I get resolution this time, I'm cancelling and going with another product. There are no phone numbers to call and trying to resolve complex problems via emails that happen once a day is not adequate customer supsport.

Absolutely an useful service! The service is a nightmare. It works very slowly when restoring files and uses a questionable cost calculation method. I was charged $1500 instead of the $99 for my yearly plan. I recommend avoiding this service due to its lack of usefulness and poor support quality.

It sucks It sucks! massive price increases and all kinds of sleazy tacktings to prevent you from cancelling the renewal.

Unreliable; backblaze LOSES LOTs of files!! I have had the year plan for a year, on 1 computer, with 1 big external drive, about 1.3 TB of total data. But whenever that drive was disconnected, Backblaze would begin deleting its backed up files, after just 2 days! The Backblaze docs claim that it will hold my files for 30 days, but it begins losing or deleting them after just 1 or 2 days!! I have contacted support a year ago about this, but nothing was improved, the problem persisted constantly. It was also extremely difficult to cancel the recurring $99!