@mcc Some people have already said "tar + something with a large compression window", but in particular tar + lrzip may be best if you go that way. It should be packaged on most distros.

It's intended to have a compression window up to the size of your RAM (or 2 GB on a 32-bit OS), or optionally even larger than RAM, though that's slower.

The "LR" stands for Long Range, even!

It's also multithreaded, which not everything is.

It can also be combined with other compression algorithms if you are a hardcore compression algorithm enthusiast.

(The only thing that bothers me about lrzip is that it doesn't preserve the file's modification time.)

https://wiki.archlinux.org/title/Lrzip
https://en.wikipedia.org/wiki/Rzip