Have finally decided on going down the Mac Mini server route for our office and I'm now looking for a backup solution. The plan is, the Mac Mini server will act as a file server and time machine backup for two - four macs in the office. I also want to be able to use as an ftp server to backup our web servers. I then want to backup the Mac Mini server to an external drive which will then sync with something like Acronis Cloud via Acronis True Image or Microsoft OneDrive, etc. Is it worth getting something like a Qnap NAS drive or should I go with a bog standard USB drive like the WD MyBook?