[miahi]

The slow upload is also a way to limit the backup size. I currently back up >4TB on CrashPlan and it took a few months of 24/7 upload.

[leejoramo]

I was going to point to the ability to seed large backups to CrashPlan's cloud, but it doesn't look like this is an option anymore.

You can still seed to a private cloud of your own, friends and family, but not to CrashPlan's server.