But MyEtherWallet is only online, right? And if happens something to the website? Will it be possible to get back the money?
Rule of thumb: forget about 'web wallets'.
I'll say it again:
do not store your coins on third parties' servers. This practice goes against the core idea of a decentralized currency and puts your assets at risk.
Always store your coins on a device that you personally own and control. Your least secure option is to use a mobile wallet. There are many mobile wallet apps on the market, but I won't recommend any of them because they inherit all the security flaws of the underlying platform - be it iOS or Android.
A better option is to use a desktop wallet (assuming you're using a Unix-based operating system, i.e. Linux or macOS). Check out
Exodus - it's a clean, lightweight, cross-platform wallet app that handles ETH, BTC and a bunch of other assets.
The most secure way is to use a hardware wallet such as Trezor or KeepKey.
Come on guys, do you even know how
www.myetherwallet.com even works? Do you know what a client-side wallet even is?
https://www.myetherwallet.com is a nice CLIENT-SIDE (javascript) wallet.
You have to have the wallet.dat on your PC for it to work.
If anything happened to the website,
nothing would happen to your wallet.
It's very good if you do not want to download the whole blockchain on your PC and be able to access your wallet from everywhere.
https://www.myetherwallet.com doesn't actually have any of your wallet's information, because it's client-side.
They do however hold a copy of the blockchain so that you don't need to download it.