As I wish to keep the backup of mail box can be done by replication or copying of any new doc from source db to backup db. But there are two drawback as below:
Backup with replication:
1. Any changes in the source doc will be replciated back to backup db and hence replace the exisiting doc.
Is it any way to do so any new doc will be replicated as a new doc in the backup.
Backup with copyign:
1. I have written an agent which is run to copy the new and modified doc in the source to backup db. But, as the agent treat all doc to be new doc when the agent is first enabled.
for both your requirements is a simple agent the best solution.
1.) Open your mail db.
2.) In menu select: Create->Design->Agent
3.) Give the agent a name, make it sharable.
4.) Select: ToRunIfDocumentsCreatedOrM
5.) Run: SimpleAction
6.) SelectAction: CopyDocumentToDatabase
7.) SelectDatabase: your destination db
8.) WhichDocuments: click on AddSearch
9.) For AddSearch select: Condition ByDate; DateModified; IsAfter: yourCutOffDate
Save the agent and it will work.
Good luck,
zvonko