Automated differential backup using 7zip for linux/windows

There are a lot of ways of doing differential backups, tons of software, freeware of shareware. I want to share one I didn't know about which I liked very much. It is unfair so little information can be found the Net about 7-zip archival tool, which can handle differential backups with ease.  Article is for CLI geeks, who understands where to push these commands )

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