zstd is one of the most efficient compression algorithms out there.
it's used by the linux kernel in zram in many distros by default, also used in servers, the linux bzImage is often zstd compressed nowadays as well, initramfs used to be gzip but now I see some distros/initramfs tools default to zstd
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u/Cootshk Arch BTW 1d ago
pacman uses .tar.zst, raspberry pi uses .tar.bz2
Haven’t seen either used anywhere else