I got these nice introduction from different threads. So thanks to Mooncoindev Barrystyle!
Backing up your wallet.dat can be done two different ways.
The firstWith your Europecoin client not loaded; open your Start Menu, and via Run or Explorer, go to the path '%appdata%' (this is equivalent to using Explorer to find 'C:\Users\<username>\AppData\Roaming').
From here, open 'Europecoin'. You will find 'wallet.dat' in this folder. Take a copy and store it in a safe location (encrypted USB disk/partition is ideal).
The secondFrom within the Europecoin wallet itself, select the 'File' menu and then choose 'Backup Wallet'.
Exporting your private keys can be done via the following method:
Open the debug console, enter the command 'listaddressgroupings'. This will list all of your public keys which have/or have had a balance. Feel free to copy the output to somewhere easier to work with it.
From here, any address which contains a significant balance; select and copy its address (without the quotes) and enter the following into Debug:
Europecoin will list the private key for you, copy this information into a file and save to a safe location (same as above, encrypted USB disk/partition).
Do not leave your private keys laying around; and do not post them here, nor message them via privmsg etc - anyone who has this key can import and take your funds.
Greetz
Steve