Don't do this. Make a new wallet, at creation you get to write words in a paper, thats your cold storage paper backup right there... Now move the funds to that new wallet and delete it.

Keep the paper safe, its all you need to ever retrieve your funds back in the future. Its recommended to make another physical copy of it (with your hands, zero electronics) and keep both safe.

Again, don't backup wallet.dat or even attempt to analyze it with tools. Just play it safe and move the funds to a modern wallet with a proper seed word phrase. Also see why paper wallets were replaced by the seed word system, any sort of direct handling a private key are a big no no. Too many points of failure and lack of security.

You may think the seed words and the private key are the same thing, but they aren't. Those words are so easy to conceal and manually copy, the private key isn't, which makes people tempt to use an electronic device, opening the doors to a whole can of worms.

When you make a new wallet, you have to write some words in a paper with your hands, this is the most important thing for a wallet, nothing else matters, no password, no 2fa, no hardware gizmos. This very paper is the core and soul of it, never forget how important this is, and yes, you can lose anything else.