To back up your wallet, you will need to create a copy of your wallet's seed phrase. This seed phrase is a twelve or twenty-four-word phrase that can be used to restore your wallet if it is ever lost or stolen.
This process involves writing down the seed phrase on a piece of paper or storing it in a digital file and then keeping it in a safe location. It's important to make sure that your seed phrase is stored securely, as anyone who has access to it can potentially steal your cryptocurrency. It's also a good idea to create multiple copies of your seed phrase and store them in different locations so that you have a backup if one copy is lost or destroyed.