debpartial-mirror 0.3.1+nmu1build1 (amd64 binary) in ubuntu focal

 Mirroring of partial Debian repositories is easy with the
 debpartial-mirror tool.
 .
 With it, you can mirror selected sections, priorities, packages,
 virtual packages, or even files and directories matching regular
 expressions. Packages may be drawn from any number of sources,
 with dependencies for each source resolved from whichever other
 sources you specify.