It is kind of setup and forget, hope for the best. The setup is of a backup is easy. Restoring single files is painless. But that is where the positive ends. It is cross platform.
I have been using CrashPlan since ever Mozy Backup went downhill. And it hasn't been a great experience. As a developer I have a constant need that things are backed up, and CrashPlan does that... at a price. First the dollar price is no longer competitive. The memory and CPU price are huge. I've seen CrashPlan use 8+gb of memory, and it wanted more. It is no longer able to backup files larger than 1tb. Pruning old versions every few weeks takes... a week. 3 of my 5 backup schedules do not trigger automatically as they should. Backup and restore speeds are slow, not able to use more than 10% of my network speed. Just now they stop allowing backups of VM's... really, my 2gb VM file is going to kill you?
Support, well, not so helpful. Over they years I had like 5 support requests. I'm not convinced they are helpful. While you always get canned answers and link. My problem of not being able to backup large files or using the scheduler are unsolved. I gave up asking and explaining.
And, no more support for Win 2008 Server soon...
Little things, lots of them, none are good.
Just stay away from it.
I'd look at other solutions before considering CrashPlan. I'll be heading to Backblaze when my pre-paid term ends.
I hope they have a secure backup, but I'm not sure if a restore would be fast enough.