If you don’t have one already, you might want to consider getting an Uninterruptible Power Supply (UPS). The reason is simple: a power outage or spike can occur at any time which can wipe out not only what you are currently working on, but possibly your computer components as well.
A UPS’s job is simply to ‘filter’ power as it comes in from your wall outlet and send a constant power current to your devices. If the power from the wall spikes the UPS handles it, likewise if the power drops the UPS pulls some extra power from the battery to make sure everything remains constant. Additionally, most UPS devices come with software which can automatically shutdown your computer gracefully when the battery power runs low.
Here is a really good comprehensive FAQ which covers UPS devices.
Ultimately, you really don’t need too much with regards to a UPS. Just make sure the battery will last long enough for you to save your work and shutdown your computer in the event of a power outage and you should be ok.