System
Health of the things SetPoint depends on, and the settings that are not tied to one integration.
Dependencies
Checked on demand. This page is the only thing that runs these checks, so the numbers are from the moment you loaded it.
Backups
Recorded by the backup job itself, only after it succeeds — so a failing backup ages here exactly as a missing one does.
Background queues
A queue can exist, accept work, and silently never run it. That is the failure worth watching for, because nothing errors — email simply stops arriving.
Settings
Every change is recorded in the audit log with its previous value. Integration credentials live on the Integrations screen.