Originally Posted by b0redom 
Sounds like a job for an external drive + time machine tbh.
I agree. Just plug in an external drive and click the option that pops up asking for it to be used as a time machine drive.
Nothing more needed really.
I'd not touch the drobo its over priced and under featured. Add to that if a drive fails or the unit fails you need a drobo to recover the data I believe.