The best way to preserve the privacy, privacy and confidentiality of your files is, directly, encrypting them. How to do it? Well, for example, with this tool called DP-Multi Crypt.
The process that DP-Multi Crypt follows is very simple: it compresses the file in the compression format that we previously selected and then applies an encryption algorithm (it allows you to use some of the most popular ones, such as Cast256, IDEA, Mars , RC4, Twofish, RC6, Rijndael, etc.); some of these algorithms are 128 bits and others 256 bits.
DP-Multi Crypt is totally free.
You can free download DP-Multi Crypt 32, 64 bit and safe install the latest trial or new full version for Windows 10 from the official site.