If you own the game (as I said - legitimate uses), then you already have copyright permission to own that game's files, so there is no copyright violation.
But you're still wrong*, unless you think the entire population of NZ consists of librarians and other "authorised" people- rather ironically I may well qualify as authorised and my dad very likely does, but the vast majority of people certainly won't.
But as I said earlier, you're pretty much certain not to be prosecuted either civilly or criminally for it as it is close to impossible to prove and nobody would waste their time trying unless it's a mass distribution type thing. Or someone has highly paid lawyers sitting around wanting to justify their stipends.
Just be glad we aren't having this debate under the old laws where copying music from a CD to your computer or iPod was illegal...
*I admit my wording could have been far clearer on the why though.
Wow -- all the fuss have been all around DRM these days!