An archived account is one that has been disconnected from our data provider, but that still has data stored in Tiller's databases for pulling into newly linked spreadsheets.
Archived accounts only appear if your account required a migration performed by the Tiller team between 2019-2023.
The Archived Accounts section on the Console at https://my.tiller.com/ helps organize these accounts and keeps them visually separate from live connected and feeding accounts.