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Linux is a family of open source Unix-like operating systems based on the Linux kernel, an operating system kernel first released on September 17, 1991 by Linus Torvalds. Linux is typically packaged in a Linux distribution (or distro for short).
Distributions include the Linux kernel and supporting system software and libraries, many of which are provided by the GNU Project. Many Linux distributions use the word "Linux" in their name, but the Free Software Foundation uses the name GNU/Linux to emphasize the importance of GNU software, causing some controversy.
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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
That's why I think AppImage is the best. Despite needing to pack everything it needs it's always far more lightweight than flatpak. I'd rather download a 50mb appimage than several gigabytes of an entire OS libraries and then the updates requiring roughly the same size. That and I have a shitty internet
I have all apps I use daily in the appimage format. Yesterday I decided to try btrfs for my root partition and did my annual Linux reinstall. All my apps were already there and ready for work from the start.
I also have a usb flashdrive always on me with the same appimages. Just in case I'd wipe a hard drive by accident and wouldn't have an internet connection or something like that (in case of emergencies). You can't do this with flatpaks or snaps.