I heard a few minutes ago about the 31th of March being the "world backup day". I browsed with this search word and found offers up to 45% off for mass storage disks (already at the lower price edge. I don't know if it is available in NZ too, but getting a WD40EFRX for 105€/ea. incl. VAT (~179 NZD/ea. incl. tax) isn't that bad.
Maybe you can find something similar in NZ. The mottoe of the day is: 'Any data backup is better than none at all.' Do you agree?