You should regularly back up the Group Chat database. Contact your database administrator to determine how best to do this in your environment.
The files posted on chat rooms, which are stored in the file repository, are not in the database and should also be backed up.
After you back up the SQL Server database, use the following procedure to back up the file repository.
To back up the files in the file repository
Log on to a computer that hosts the current installation of the Web service, by using the account that owns the server processes.
Go to the location of the directory that stores the file repository, which is determined at installation. For example: C:\Program Files\Microsoft Office Communications Server 2007 R2\Group Chat Server\WebSvc\FileRepository\
Leaving the original files intact, create a compressed file archive of everything in that directory.