the bitcoin wallet backup.dat file is in my documents but I'm not an advanced computer user I have the complete bitcoin qt on my computer but don't know how to restore from the backup

  1. Close Bitcoin core so that the program is not running.

  2. Go to /Users/{yourusername}/Library/Application Support/Bitcoin/ and there you will see much of the blockchain data, and a wallet.dat file.

  3. If there is a wallet.dat file here that you also need, save it elsewhere by copying and pasting.

  4. Put your backup.dat in this directory, and rename it to wallet.dat.

  5. Start Bitcoin-QT with the -rescan option so that it will go and look for any coins that your received in the blockchain.

That's it!

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