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I'm looking at moving to a place where electricity may be off at night, and consequently a Philips HF3250 light alarm should still function as a lamp but would forget the time daily.

(Note that I have tried using iPhone apps for this purpose; the light on my phone display hasn't been sufficient for me personally.)

What, if any, uninterruptable power supply options exist that would be small, would have a low power draw, and would give my alarm enough power to not forget the time if electricity is turned off overnight?

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    It says it draws 16.5 watts and comes with a transformer to supply 24V. If that's DC you might be able to take off the transformer and connect it directly to a couple of lead-acid batteries in series, and thus cut out the middleman of the inverter. Alternatively, perhaps you could look for a lower-power one that's powered via USB? Then an ordinary USB power bank could serve your purpose - way cheaper than a UPS. – Nate Eldredge Jun 12 '17 at 21:41
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    The HF3250 appears to weigh over 3 pounds and be fairly large - not very convenient to travel with, especially if you need an AC UPS which are typically quite heavy. Another point in favor of looking for different devices. – Nate Eldredge Jun 12 '17 at 21:43
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A small computer UPS would work, but might be troublesome to transport during travel (due to the sealed lead-acid battery contained within). I've seen them as cheap as $40 US for a 350VA unit. As a plus you could connect your cellphone, tablet, camera charger etc. and ensure that they were at 100% when you awaken.

You could also consider a similar clock with backup battery built in, but the quality may not be as good as Philips. Some do exist.

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