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Flatpak uses OSTree, like Fedora Atomic Desktops (Silverblue, Kinoite etc) and similar to BTRFS snapshots.
So many files are deduplicated and linked, not actually there
https://gitlab.com/TheEvilSkeleton/flatpak-dedup-checker
50GB without
31GB with deduplication
21,4GB with BTRFS compression
I fell for the lie of flatpak not being bloated, I just nuked flatpak from my PC since I just run arch anyways. Im not sure if repo is safe to remove. You might be able to run
rmlint -gand see how much data can be deduplicated on an FS level, I never checked myself since I run f2fs, but if you run an FS with dedupe capabilities it may work for you.Flatpak uses ostree just as my system. So probably lots of the files are already deduplicated and it is not as dramatic as it seems.
Why do you care about 20gigs? A 128gb SSD is 10 bucks.
so, are you paying for it?