@danp
You can install and trial it, you get 50 GB free when I was working there, for like 2 weeks and do whatever you want. No credit card required.
Think about it as very advanced client for Amazon Glacier storage for windows clients, sadly they only have good Windows and Android clients. Plus point for supporting Dedup in backups, if you have windows 10 ISO file that is already uploaded, they will not upload it again.
if you want to backup NAS, they will tell you to mount it on Windows machine and select it to get uploaded.
And their Technical support team is awesome, I was there (5 years ago) what more do you want.