THIS STEP IS VERY VERY VERY IMPORTANT
In case of your HDD failure, if you didnt back up your wallet, you way loose your coin forever !!! (it applies for all coins)
_For web wallet, you dont have to do it, the website will do it for you. Just keep your log in info safe
For Windows users:
For GUI wallet and CLI wallet (command line), on windows, your wallet should be stored here : C:\Users\YOUR NAME\b2bcoin
Just make a copy of your wallet (.wallet file) whatever you want : CD/DVD/USB/ ......
On the GUI you can also save your wallet : in the menu > wallet > backup wallet
Choose a (safe) location and click "open" (little bug), it will save your wallet. Then put this file whatever you want : CD/DVD/USB/ ......
_For Mac and Linux users:
Make a copy of /users/%username%/b2bcoin for linux
Make a copy of /Users/%username%/b2bcoin for MAC
Put the copy on CD/DVD/..........