An uninterruptible power supply (UPS) will allow your computer to continue to function for a period of time when mains power is lost. This can help you to smooth over short-term (1-5 minute) loss of power by running from the UPS battery. When the UPS battery is running low, the UPS can signal your computer to shut down cleanly. With a UPS you can avoid lengthly filesystem or RAID checks due to abrupt power loss. Here are some tips on UPSes in general and how to set one up to protect a Linux machine, even if the model you have lacks explicit Linux support.