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I can't recall a name, but at one time there were "infect-on-mount viruses". I am not sticking up for the repair shop, but just saying......

I agree pure sine wave is best, but it is better to have a a simulated ups than no ups at all.

https://nerdtechy.com/ups-need-pure-sine-wave

APC has wide acceptance. Yes, you have to check the light to show it is operating properly.

In addition to back-ups, I highly recommend you invest in a UPS. It does not have to run everything, just your pc and any external hard drivers.