Is anyone using either BackBlaze or CrashPlan for backing up multi-TB of image files?

If so, what was your upload experience for you initial archiving? I'm expecting weeks for 2 to 3-TB, but there's a big difference between 3-weeks and 3-months!

Also, I'm worried about the financial stability of these companies. The companies like Carbonite, Amazon, etc., with a lot of financial wherewithal, have severe limits on total storage usage. These smaller companies have unlimited plans and very competitive prices, but I wonder if they'll be around when it's time to recover files.

I'm beginning to think that putting a NAS drive at a friend's house and keeping one for them at my house is the way to get offsite backup that's reasonably reliable and reasonably cost-effective. Still, after initial load-up, cloud storage is very tempting.