Trigger which fires if entry in Windows Eventlog is missing for specific time

[toskala]

Hi there,

I am using a backup script which writes to the eventlog when it starts and when it finished the job.
Now I need a trigger in case it does not start within 24h after the last time it started.

Here's what I did so far:

Item Name: Backup started
Key: eventlog[Application,,,MyBackupScript,100]
Type of Information: Log

Latest data now shows:

Last Check: 30 Apr 2014 14:42:05
Last Value: backup started

My trigger looks like:

{Template MyBackupScript:eventlog[Application,,,MyBackupScript,100].nodata(86400)}=1

If I understand this correctly the trigger should fire when there is no new event logged after 24h?

Thanks in advance,
toskala