We are using HP DP 6.11 for backing up AD. Full backup for AD is performed daily but still we are getting Event ID: 2089 on all of our DCs.
This directory partition has not been backed up since at least the following number of days.
Directory partition: xxxxx
'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.