You don't need a second card slot.......until you need it. But seriously I've never had a card fail on me in (photography use) in 10+ years. I now have cameras with dual slots because I can't risk losing photos and "one is non two is one" thing applies specially on this. I just change cards when I upgrade cameras every 2-3 or so years specially when cameras need faster and faster cards
You don't need a second card slot.......until you need it. But seriously I've never had a card fail on me in (photography use) in 10+ years. I now have cameras with dual slots because I can't risk losing photos and "one is non two is one" thing applies specially on this. I just change cards when I upgrade cameras every 2-3 or so years specially when cameras need faster and faster cards