D Drive full.

In a perfect enviroment, I would have 2 HDs and 1 NAS:-1 HD for Windows, programs and disposable data.
-1 HD for important files
-1 NAS for backing up important filesOr in a more paranoic setup, I would have another NAS to back up data on the first one. Or a four HD NAS in RAID 1

nas devices usually use raid internally.

Replying to #22

I know that. But you're not forced to use raid even though most 2 HD nas comes pre configured in raid 1.