I've commented in one of your threads related to this and it seems like you are not comfortable on using the Coinbase Vault as you have a lot of questions about it and you are worried about its safety and how it can be hacked by someone else. Maybe I can give you an alternative for your storage problems, if you don't want to buy a hardware wallet and you aren't comfortable with using a service like Coinbase Vault you can always create a cold storage of your own by using an old phone/laptop where you install Electrum and you keep that device offline meaning not connected to the internet at all, in this way you have a peace of mind about any hacks happening from your wallet as it is an offline device.