We need two open source programs: Gzip is a compression utility with a high compression rate and free from patented algorithms. GnuPG is a complete and free encryption solution to protect confidential communication and digitally stored information. Create a /backup directory in each of your working directories.
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Write the above code in a file, put it somewhere in your path and assign an icon (I am running this from the buttonbar of TotalCommander (R)). One click – and your current directory is being saved as zip file and signed with your key.