rzip binary package in Ubuntu Focal amd64

 rzip is a compression program able to take advantage of
 long distance redundancies in files, allowing greater
 compression ratios. rzip uses a history buffer of up to
 900MB, while gzip uses 32KB and bzip2 uses 900KB. rzip
 cannot read from the standard input or write to the
 standard output.
 .
 This package provides rzip and runzip commands.

Source package