See also
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Understanding btrfs to reinstall without losing data - #2 by vekruse, and
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How to Reinstall (Clean Install) Fedora 34 without losing data (/home)? - #9 by dhvlktry, and
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Help with some doubts about reinstall fedora with btrfs - #5 by chrismurphy, and
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QA:Testcase partitioning custom btrfs preserve home - Fedora Project Wiki