UPC how long and how much?

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I have an 8 channel DVR running with 4 small cameras 600TVL. It is just a small all in one home system (kguard). I have it hooked to a router linksys WRT54g and a modem.

I was thinking I would like to have a 15 to 30 minute UPS just in case.

So my question is what VA / watt system should i look for for this system.

I have no ideal what the draw from the drv and cameras is but they run on 10v3a plugs.

I keep my DVR in a large heavy safe. Should i consider keeping the UPS in there as well or would heat be an issue?

Im probably not giving enough info for a great answer im just looking for ball park.

Thanks for your time.