You can store your keys on flash drive 2 copies needed. Keep flash drive always offline.
When you need transfer your moneys connect flash drive and copy past key, its needed if your pc have keylogger
I would recommend using more than 2 usb flash drives as they are known to fail. You might also consider getting a dedicated hardware wallet if you have a significant amount of BTC, although with current prices "significant" could be as little as 1 BTC.
Also be sure to protect your wallet keys with a strong pass phase.