The answer depends on which type of computer you are using. Mac
If you are using a Mac, simply create an encrypted archive (or several of those), and drop everything there. Only the NSA will have the power to break that archive. I guess they have better things to do, though
Finder > Applications > Utilities folder. Choose 'Disk Utility'. On the top of the menu, select File > New Image > Image from Folder. Choose the folder you wish to add a password to, then click 'Choose'.
On the next screen, choose your level of encryption (the higher the better) and your password (the longer the better - it can be a complete sentence). Click 'Choose'. Next, next to 'Image Format', selection 'Read/Write'. Select 'Save' to exit the window.
Once the system finishes encrypting the folder, click 'Done'. Exit 'Disk Utility'.
Your newly created .dmg file is secure. You can use that .dmg file just as you would any other file. Double-click at any time to open it; you'll need to type in the password to complete the process.
Alternatively, you can use Veracrypt (see below) Windows
You can use Microsoft's free Bitlocker, or :
- VeraCrypt https://veracrypt.fr/ (excellent software with a HUGE advantage : it works also on Mac & Linux. So you can open your archive in any of the three systems)
- DiskCryptor https://diskcryptor.org
(if you need help, contact us and we will help you)
We are personally using Mac with the solution above. All our naughty archives are encrypted this way, and then backed-up. If we die, nobody will be able to open them.