For your department and faculty meetings, it makes sense to have an ongoing Google Doc with notes from all meetings. This makes it easy for everyone to find past notes and the current agenda. However, you don't look at past notes too often; It's good to have them when you need them. Contract them. Set the meeting date as the header and collapse the past notes section. This provides an effective table of contents to quickly identify which meeting notes are available. Click the arrow to expand the section and reveal the information.
I was collaborating with a co-teacher on lesson plans. We use the same Google Doc for all daily lessons and resources. The collapsible headings made the document seem much less overwhelming.