View History of Parameters for Contact Lists
A member of my team had accidentally removed some of the filters for one of our contact lists recently, and I couldn't remember what the filters had been. This was crucial, because this had been a list of customers that we DID NOT want to email for the time being.
A helpful Hubspot rep (Jordan) did what he could with me, but ultimately there was no way to view this history (we were only able to view the date that the change to this contact list was made).
I'd love to suggest the preservation of past contact list data, the ability to view history of changes made to contact lists, which account made these changes, and what date/time.