I have used the CrashPlan service for two years, and I have a paid subscription for another two years. I like it, and I would recommend it. You can not only backup your data to their Cloud, but you can also backup locally to another computer or hard drive (for free) or to a friend's computer.
But the uploading process is very slow, which is probably due to the slowness of uploading any data, as well as due to the slowness of the application. You can always send them a hard drive, but few people will do that. If you do it yourself from home, then you should expect to have your computer engaged for several days (in the background) sending your files to their remote site. Obviously, the more data you want to send, the longer it will take.
What I don't like about CrashPlan is the application is ALWAYS working. I can't seem to stop it! I constantly hear it accessing my internal hard drive and my external hard drives, even after I have achieved a 100% complete backup status. The Energizer bunny rabbit has got nothing on this engine: it just keeps chugging away, and I find it irritating that I cannot stop it, for it slows down my access to other things I want to do on my computer. The engine is either backing up files, or it is "synchronizing" the files which have already been sent to the remote site with some kind of index it keeps on my computer.
I play with the settings, but they don't seem to have much effect. I use the command provided to terminate access to the service, but the engine of the application still keeps chugging away. It's totally out of my control, and I don't like that. I am waiting for some tech support to see if I can get a hold of this monster and take control back into my own hands. I don't even know if that is possible, but I am tied of hearing it accessing my hard drives all the time. Please stop, CrashPlan! Please, give it a rest!