Thanks. Not really sure, let's say about 10 minutes only. It is more for stability issues than loosing power for long periods of time.
The power supply for the printer is rated 220W, the spec sheet (http://www.meanwell.com/productPdf.aspx?i=538) says that the max typical AC current is about 2A, so i would suggest you look at a unit that can take 500VA or more.
Do bear in mind, most low end UPS' have a changeover time. I've measured this across a few units with an oscilloscope and have found that the nasty "modified sine wave" (square wave to you and me) doesn't properly kick in for 15ms in some cases.
If you really have a concern about this, look up a "duel conversion" UPS. They are always outputting from their inverter (and most output a proper sine wave). So when there's a blackout or brownout, the supply is never lost.
Then it's just a case of sizing one for your printer.
I'm not the right person to answer that question as I have no experience with that type of setup. But, those that do will probably also want to know for how long the printer needs to be able to run without power?
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