I've been using zstd more and more for general compression. Using it with
tar is pretty straight forward:
tar -cvpf -I zstd /tmp/etc.tar.gz /etc
This does not allow you to set the compression ratio however. After some digging I found an environment variable that controls the default compression level. If you run
tar like this you can change the default compression level.
ZSTD_CLEVEL=19 tar -cvpf -I zstd /tmp/etc.tar.gz /etc
GZip has a similar variable, but it will allow any command line variable (not just compression ratio).
GZIP=-9 tar -cvzpf /tmp/etc.tar.gz /etc