[Blind-Computing] USB 2 and 3 what are they?

[Niamh]

Sorry to be useless here, but people keep throwing these things at me at work, 
and I  haven't a  clue what they are talking about.
Because we are security conscious  we have to back up certain files to off-line 
hard drives.
Now people are talking about USB 2  and 3, what does this mean?
Niamh
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