I bought a TT One 3rd in May 2008 in the UK with European Maps. As I was in the UK for 6 months, I backed it up on my brother's computer. Back home I bought an NZ map and as it wouldn't fit I transferred the European map onto my computer (I thought) and loaded NZ. Now I want to swop back as I am returning to the UK, but I can't find the European map;am I only allowed one backup? My brother's computer crashed and he lost ny backup in the UK. Am I lost?