Set a passphrase for your Wallet, then save the wallet.dat - if you are on Windows that file is in your User home directory C:\Users\\AppData\Local\Bitcore.(I not sure, if it is in the Local dir or Roaming, but one of those)

If you ever reinstall your system, to recovery your wallet just replace the wallet.dat in your new installation.

HODL!

you can get a backup file easy by go to "File" => "Backup wallet..." and keep it in mail or dropbox, make sure it can't lose.