Hi,
If you would like to keep your log in the event of a power cut it might be worth investing in a UPS (Uninterruptable Power Supply). It should keep it running for a few minutes to give you time to do a controlled shut down or it might be able to be programmed to shut down for you if you are not home. Even if it is just a minute or two interruption it would give you continuous service. We use a laptop so this isn't an issue for us but this would be an option for a desk top.
They are fairly pricey but if keeping a log is important to you then it may be worth the investment. Search Google if you are interested as you get different power ratings and running times.
Claire