you dont have to have 2 cards. You can write image files to the card (like you will in the turorial), but you can also make them. So when you are happy with the running masternode and all is running well, just make and .IMG file from the whole SDcard to any computer using readily available software. That way, if your SDcard gets corrupted (or destroyed by fire lol) you can just flash the IMG file to the SDcard again, and run it like nothing ever happenend. As long as you have the private key of the wallet containing the 1000+ dash you cannot loose it by fire. The 1000 dash arent ON your Pi2, the masternode just LOOKS at a wallet containing 1000+ dash as proof you have them. So make a spreadsheat with iimportant stuff in it. Make a truecrypt container with a strong password, zip it with another password, mail it to yourself andhang it on your keychain with a usbthumbdrive and you always can recover the 1000+ dash. Even if your house is burned down.