On-Cloud : How to delete unnecessary Project (or Contents) & Space?

My ENV: On-Cloud 


I don't know if it will be limited to cloud environments.

First of all, I will talk about two things, Space and Project.

I have a lot of Space and Project
(training, testing, obsolete, etc..)




To delete a space, the space must be empty.
However, it contains a lot of content and projects.





In the case of a Project, you can simply make it invisible by changing the filtering and maturity level.



However...


If you must delete Space and Project, which method is correct?

Do you need to remove members from a specific Space, and change many Projects to "Terminate" state?


I got tired of a lot of unnecessary Project (Task..)


How do I keep it clean?



ps. Space control is always difficult.. ^^;;