How many backups should I make of my Wallet and where should I keep the wallet? USB, external drive and local drive?
Great question Pijpen and I will put something up on the official forums later.
I would have it on 2 USB sticks, keep 1 in your real wallet with password protection (this is incase your house gets robbed), keep 1 in your house incase you get mugged.lol
If you going to keep it on local drives make sure you rename the file to something people won't recognize.
Another thing you can also do is have it on google drive or dropbox. Once again rename the wallet.dat to something completely different.
Important, everytime you add a new address to your wallet you will need to back it up again. So best practice is to create about 10-20 addresses upfront and then do a backup.