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Its a good idea to make backups of your wallet, whether you are using the QT or the daemon to store your denarius coins. First of all, always use a very strong password on any crypto wallets you have. 64+ characters with no funky symbols. Backup wallet.dat The basic way to do this is going into the QT Wallet and selecting Settings -> Backup Wallet, go your your USB drive and put this wallet.dat in a folder like d:\backup\2019-07-29 D\wallet.dat This way you can have backups from different days. A few USB drives rotating like this is a great way to store your crypto wallets for just in case anything happens. You can also find your chaindata folder, and copy/paste the wallet.dat to your USB drive. Backup Private Keys Another way to backup your private keys is by going into debug console. I type help to get a reminder on commands. What you do with this one is dumpprivkey DADDRESS. Be very careful here as if your PC has a keylogger or remote access someone else can see the private key, Generally disconnect from wifi and/or ethernet completely before running this just in case. Maybe even run this command in a separate virtual machine. Just be very careful here. This will give you your private key in the output. Save this somewhere that can't be seen, maybe like writing it down or etching into titanium. Another method to dump your private key is dumping the entire wallet.dat. This will create a text file that has a list of your addresses and private keys next to them. I would not be connected to the internet doing this. This command you type like this dumpwallet makeupnamehere.txt The text file is stored where your chaindata is located, which would be where your wallet.dat is located. What I would do with this text file is zip with encryption using a strong 64+ character password. Be extremely careful if you print this out, as who knows if your printer is hacked or has something watching what is printing.