Hi, If you don't care for a backup - configure circular logging. Your method will not truncate the logfiles and it will create new sets of logfiles - one set for each database. Leif

Hi, Lets say I have 4 mailboxdatabases (in a DAG), I haven't done any backup so the transaction logs are getting pretty big. If I create 4 new mailboxdatabases and migrate all mailboxes to the new databases, will the transaction logs be truncated, left on the old databases or will they move with the mailboxes to the new databases? If they're left with the old databases, can I just delete those and get rid of the transaction logs? If I can't remove the transaction logs like this, is it possible to truncate the logs without doing a backup? Thanks,

Hi, If you don't care for a backup - configure circular logging. Your method will not truncate the logfiles and it will create new sets of logfiles - one set for each database. Leif

Hi, when you have an old database with many logfiles and disabled circular logging and you move all mailboxes to the new mailbox database also with disabled circular logging. Then the new database will create new logfiles. In this scenario I do it like this: create the new dbsenable circular loggingmove mailboxes to the new dbafter moving all mailboxes I disable the circular loggingnow enable circular logging on the source db and dismount / mount the dbafter a short time you can see only a couple of logfiles at the source db log folder BTW, a daily backup from the Exchange DBs is not too bad :-) ArneArne Tiedemann | Active Directory and Exchange specialist

Hi, when you have an old database with many logfiles and disabled circular logging and you move all mailboxes to the new mailbox database also with disabled circular logging. Then the new database will create new logfiles. In this scenario I do it like this: create the new dbsenable circular loggingmove mailboxes to the new dbafter moving all mailboxes I disable the circular loggingnow enable circular logging on the source db and dismount / mount the dbafter a short time you can see only a couple of logfiles at the source db log folder BTW, a daily backup from the Exchange DBs is not too bad :-) ArneArne Tiedemann | Active Directory and Exchange specialist

Thanks for the answers. I mapped a network-drive to one server and ran Windows Server Backup, it took a while I can tell you that but the transaction logs got truncated and released a lot of space on the disks :) I didn't know about circular logging before so I will look in to that. Thank you very much!