Does Rancher controller need to keep old catalog cache?

It looks like there is a lot of catalog cache (most of it probably outdated) in the management-state folder.
Doesn’t Rancher do garbage collection and cleanup?

I’m in the middle of backing up our Rancher 2.1.1 controller so I can upgrade to 2.3.0.
I’ve been stuck for over a half an hour waiting for the backup to be complete and the biggest part of the backup seems to be the catalog cache (see image below)

Do we need to trigger garbage collection manually or should Rancher handle its own cache garbage cleanup?