Granite Portable is so easy to use that even if you don't know much about security you can still can protect your device using its simple interface.
Basically, Granite Portable offers a vault-folder where you can store very important files regardless of file type and without size restrictions.
To access the folder, you'll need to use a username and password you've set up yourself. You can also disable the write option in your memory so that even if someone gets in, they can't change anything.
In addition, Granite Portable can protect your device from viruses, so you'll never lose important data.
All this in a standalone version of Granite that can run on any computer without installation.