Restore-build package from system to deb?

Question

ubuntu

There is a system with the xubuntu package installed,
but you need to transfer it to another assembly
, is it possible to restore the package from the system to deb
or the entire system through remastersys only

Answer 1

The question is not entirely clear, but it is possible to find downloaded packages here /var/cache/apt/archives/.
apt-cache show will show information about the package, and dpkg-query -L will show a list of files created from the deb package.

Answer 2

and if the cache is cleared, the packages are saved?