A backup admin account is meaning less for this hack, he simply modified either a template or added code in a php file to call his site & code.
The user table crash is hard to say, it might or might not of been caused by the hacker.
There is really no need to do a backup either, removing what he did is rather easy, but as Loco stated, upgrade everything to plug the hole he used to hack the site in the first place.
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