Dear Anna,
Unfortunately, data collection is not possible during our monthly REDCap maintenances.
That's the reason why we usually schedule our maintenances when the REDCap servers usage is at its lowest (from 6/7 to 8 a.m.).
Regarding the automatically generated emails (Alerts&Notifications), they are being queued by REDCap and are released as soon as the servers are back online. As such, your emails are never lost but may be delayed by a few minutes.
Best,
C.
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