Thank you Saturn but that is pure chinese for me

I saw in some deb packages something like this, for ex.:
theme.ini and below theme.ini.backup (or something like that, this is not exactly).

I assume that the files with the .backup extension will be restored after uninstallation.

Does anyone know something like this? It is possible?

I think that this method should make a backup of each file that would be replaced/edit/deleted with a .backup extension