There are many reasons why a the server is terminated

When this happens, any scheduled task that were due to run over the downtime period are missed.

This has now been fixed in ecflow 5.

When the server is restarted, the checkpoint point is read. We then determine how out of date the suite calendars are with real clock

If they are only out of date by less than an hour,  the  suites, time attributes will catch up to real time.

Hence any scheduled task over the last hour should run.

However there are a few limitations: