How Do Online Virus Scanners Work?

Posted by user185812 on Super User See other posts from Super User or by user185812
Published on 2012-11-13T17:00:32Z Indexed on 2012/11/13 17:03 UTC
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I have seen a lot on free online virus scanners available online lately. I was considering trying one of them out, but I have a question. If I have company word documents, excel spreadsheets, etc on my computer, do these scanners just take a copy of everything on my hard drive, put it on their server, and search through them? Or do they just use virus definitions and scan through my computer without taking a copy of all my data?

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