Use an outlet checker, as mentioned in another post, to check for a proper ground. This is for safety. A bad ground won't bother the computer at all.
A battery-backup is overkill for simple protection. It's main purpose is to protect against a power outage. Most batery backups, as far as I know, don't isolate the computer from the power line. They switch to an isolated supply (the battery) when the outlet loses power.
Otherwise, power from the outlet goes through a filter, then to your computer, just like a surge-protected power strip.
"Surge" and "glitch" are misnomers. What you really need to wory about are lightening strikes sending very high voltage spikes into your house's wiring. Most spikes are brief and low-amplitude, and don't get through the computer's power supply. A lightning strike, however, can punch through the insulation of the power supply and then into the electronics.
A surge protector shorts out this high-voltage before it gets to your computer.
For most people, a 15$, surge-protected power strip is all you need. It's all I have, and I've never had any problems with a power spike since the early 80s, when an unprotected modem was destroyed by a lightning storm.
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