Where are the files for Agenda stored?
They are stored locally in Agenda’s container in the user’s library folder. You can access it in the Finder by using the Go > Go to Folder… command and typing:
~/Library/Containers/com.momenta.agenda.macos/Data/Documents
Be sure to not edit or move any files or the container itself though!
Are these on Agenda servers or on our individual machines?
Locally, we don’t have Agenda servers where user data is stored.
Also, when you opt to sync are you opting just to send data to the iCloud for your account and then you can choose to “access” that data as long as you sign in?
Correct, it’s stored in iCloud in your personal account, nobody but yourself can access your Agenda data, so also we can’t.