Using an uninterrupted power supply (UPS) to plug your computer and monitor into is a good thing; BUT, it is not a good idea to plug a laser printer into a UPS.
Laser printers produce a high current draw that will “sag” the utility line causing low voltage situations. You may get away with plugging into the UPS for a while, but eventually, the powering up of the laser printer (especially during print jobs) will weaken the battery in the UPS. In one case I experienced, the user reported that their computer was shutting down during print jobs. The cause was the laser printer was plugged into their UPS. I have seen where a separate UPS is used exclusively for laser printers, but most people at home are not going to go to that expense.
What is a UPS (uninterrupted power supply)?
For those who do not know what a UPS (uninterrupted power supply) is… CLICK HERE to see examples. Typically a UPS will have multiple outlets with some of those outlets reserved exclusively for battery backup. All the outlets typically will offer surge protection. For home use, you will be plugging the computer and monitor into the battery backup side of the UPS. When a power outage occurs, the computer and monitor will remain “ON” for a period of time so that you can safely save your files and safely shut down the computer.