I don’t know about Carbonite but with Crashplan, you can upload to their cloud for 5 bucks a month or you can seed your backup with a 1 TB hard drive for a one time $130 charge.
I have over 1 TB so I chose the seed option...they sent the drive and I put my most important 1TB of data on it and sent it back....2 days later it was on their server and I just filled in the blanks. Now, the 5 bucks a month syncs my 1.5 TB to their cloud which takes very little bandwidth.
If you have a system crash, they’ll seed the drive and send it to you. You do your restore and send it back.
It’s a great system.
The Pro version is even cooler.
Crashplan, the choice of Information Technology professionals :-)