Windows 2003 server event id 2089 NTDS Replication error (server crashed and still in AD)

I seem to be getting the error below:

This all started when the server crashed, I ran ntdsutil and removed the crashed server, but there must be another setting somewhere where the old server is still in the AD.

Any idea on how to remove this server from AD?

This directory partition has not been backed up since at least the following number of days.
 
Directory partition:
CN=Schema,CN=Configuration,DC=abc,DC=com
 
'Backup latency interval' (days):
30
 
It is recommended that you take a backup as often as possible to recover from accidental loss of data. However if you haven't taken a backup since at least the 'backup latency interval' number of days, this message will be logged every day until a backup is taken. You can take a backup of any replica that holds this partition.
 
By default the 'Backup latency interval' is set to half the 'Tombstone Lifetime Interval'. If you want to change the default 'Backup latency interval', you could do so by adding the following registry key.
 
'Backup latency interval' (days) registry key:
System\CurrentControlSet\Services\NTDS\Parameters\Backup Latency Threshold (days)