Greetings, this is PlayCoin Team.
For this time, we will show you how to back up your core wallet.
1.Open your QTUM Core Wallet, press “File” on the tab as shown below.
2. Select “Backup Wallet” button in the “File” tab.
3. When you select Backup Wallet, you will see the pop up like this. You must save this backup file to your personal space. (You may modify the name of the file, but make sure it is .dat file).
4. Make sure that your backup file exists.
Thank you very much!