archiving a private channel

Hello members,

first time here on this forum. Hope to learn a lot from here.

I'm experimenting on how to deal with Teams in our company.

The intention would be that we set up a team per department, with a private channel per case.

In the private channels we can then add several guests.

However, if I understand correctly, there is a limitation in the number of private channels in Teams (30).

Once a case is completed, I should be able to archive the channel so that space is made available for a new one.

Is that possible in Teams, or possibly in SharePoint? Found out how to archive a Teams, but not a channel.

Ronny