Duplicati have possibilities for deleting folders&files after complite archivation?

Welcome to the forum @t666300

There’s nothing built-in. What OS is this? Are you able to write some scripts to get this? I’ll also say
Duplicati is a backup program, best at handling ongoing files, and not meant for archive-then-delete.
Other tools exist that can move old files elsewhere. They won’t keep versions, but you don’t need to.