NAS + automatic online back-up recommendations

I need a stand alone, pre-built NAS solution with built in online back-up to a service like dropbox or similar.

It's just for office documents and pictures, 1TB would probably last years, anyone got any recommendations?

I use one of these:-

http://www.amazon.co.uk/Western-Digital-World-Networ...

but rather than use the WD backupsoftware I use Memeo Premium:-

http://www.memeo.com/choose_backup.php

It works OK for me and the backup software doesn't require the NAS switched on all the time as it remembers which files have changed and incrementally backs them up next time the NAS is on. You can set it for any number of past backup copies (I just set it for one).

Thanks Gary, looks just right for the job.

How much online storage do you get with memeo?
Had a quick look but couldn't see anything.

Sorry - I should have said. I use Memeo to back up to the NAS. Re-reading your post I see you want a remote back up site, but Memeo doesn't offer this.