1. If you have MyEtherWallet wallet (or any other) you are advised to save your password / private code / JSON or the other on google drive (I suggest google drive)
If someday the hacker can get your gmail login, then your wallet will get stolen
2. Do not just save important data wallet in PC Hardisk, SD Card or other, because there are many possibilities that will cause your data lost, such as formatted, hard drive damaged and could be stolen others.
Write or printing private key will be usefull
3. To avoid hacking, then I suggest you to create 3 ETH wallets that each have different functions.
Good advice but 1 wallet is enough if you know how to secure it. Such as using difficult password and if you use myetherwallet then better import it to offline wallet.