How to archive all done tasks with one command?

[18620385582]

I read doc and know how to archive one subtree a time, but i dont know how to archive all done tasks with one command??

And in agenda's clock mode, can i let the archived tasks also exist?

In my thought, archieved task can be statisticed but can not be searched in regular way.

[epirus]

I think this requirement deviates from the main task of the software.