UPS for iMac (2011 27") . . . confused

didn't know backup ups until few days ago . . sounds better option i'm using imac (belkin surge protector).

i'm planning on plugging in 2 units ups:
1. imac (2011 imac 27")
2. external hd (g-drive)

want ups provide power imac long enough safely , automatically power down in case of power outage when i'm away computer.

found following on amazon: apc be750g back-ups es 10-outlet 750va master control system
http://www.amazon.com/gp/product/b0...&pf_rd_t=101&pf_rd_p=470938631&pf_rd_i=507846

work i'm looking accomplish?

 

on same subject.
imac need pure sine wave output ups?

 

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