NAS drive or other back up solutions

I'm currently using a raid 1 set-up to mirror my HD but it lacks flexibility really. Can anyone recommend a decent NAS drive or any other type of back up solution?

@bulby_g:

Is this an option?

https://www.code42.com/crashplan/

Either WD RED, Red Pro or Re

http://www.wdc.com/en/products/internal/nas/

I have a 6 drive nas with WD reds in raidz2