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This question already has an answer here:

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

marked as duplicate by morsecoder, Nick ODell, Murch Dec 18 '14 at 15:48

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  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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