I was reading about this last week https://www.global.toshiba/ww/news/corporate/2011/04/pr1301.html Self-Encrypting Drives equipped with Wipe Technology, they are used to secure sensitive printer buffer data. it deletes its encryption keys when power is removed or it's connected to an unauthorized host system that it doesn't recognise. I'm sure you could create much the same thing by encrypting it yourself and then storing the keys in some battery backed static ram . We really need some persistent blockchain online storage, where you could upload something and have it available permanently (maybe by buying a slot) Then you wouldn't need to store it on your PC or have it deleted by a google drive scan. Backing up is fine, but sometimes you don't want a backup in your house in case some jobsworth in the police gets the wrong idea about what a green frog means