feat: Created and wrote intro for duplicacy

backup/duplicacy.md

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+# Duplicacy[https://duplicacy.com/]
+
+## Intro
+
+For my backups I use the cli version of duplicacy, being free (unlike the gui version) and fitting the full cli idea of my builds, it was the logical choice.
+You can find the complete cli guide and information on their github[https://github.com/gilbertchen/duplicacy].