Or any other brand you care to mention. Everyone has horror stories with different brands.

You should have at least three copies of data you care about: (1) the one you're using; (2) a backup; (3) another backup, stored somewhere else. You should rotate these periodically. And remember: it's not a backup process unless you regularly test the restore process. For my Windows Server box, I use BackupAssist, with "Daily 1", "Daily 2", "Weekly 1" and "Weekly 2" disks in rotation. The "Weekly 1" and "Weekly 2" disks alternately live in a cupboard in the Electric Imp office in Cambridge. I don't test the restore as often as I should, though.

There's nothing on my NAS box that I particularly care about, though it would be a PITA to re-rip all of my DVDs and BDs, so I am considering setting it up to back up to Amazon Glacier. Everything that I care about on my Linux box is in GitHub...