How Much Backup Power Needed For 8 Channel NVR / System?

Customer of ours is providing the equipment via their HQ and we are the local folks they've chosen to put the systems in. Our scope requires a few items including a solution to provide 4-5 hours of backup.

They are providing an 8 channel NVR with embedded PoE ports and the datasheet says 20W but that doesn't count the hard drives. The 20W spec seems low but that could be because the drives will be the lions share of the power budget, no?

So if we are to specify a 4-5 hour backup that includes the NVR (20W) and 5 (6W) cameras operating on the embedded PoE switch, does an APC unit such as the SMT1500C provide enough?

We are not well versed in the calc. of this yet so any help is appreciated.

Thanks

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