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The standard backup question
(lemmy.ml)
Debian is a free operating system (OS) for your computer. An operating system is the set of basic programs and utilities that make your computer run. Debian provides more than a pure OS: it comes with over 59000 packages, precompiled software bundled up in a nice format for easy installation on your machine.
User settings are stored in the home directory, so you already have them backed up with rsync. If you didn't omit dotfiles, of course.