How to enable circular logging on a Microsoft Exchange mailbox database (otherwise known as a mailstore database), otherwise file level Microsoft Exchange folder backups may be too large (too much data to store incrementally each time the backup job runs to the Cloud Backup or Local Backup device types). This guide is only applicable to NovaBACKUP 21.x, in combination with performing a file level backup of an Exchange folder, and if the target is either a Cloud Backup or a Local Backup device type (the modern FPI device types).
This type of file entry will show up many times in the backup log if circular logging is not enabled, and if a full backup of this example folder was already done and had completed fully, as a seed backup at some point recently, and now the incremental backup run is attempted, but it seems like it is just backing up too much data or too many of these type of MS Exchange .log files per mailstore database in that case:
c:/program files/microsoft/exchange server/v15/mailbox/mailbox database 2038529844/e00000ea477.log
You will need to read this Microsoft help article on how to enable circular logging on a mailbox database: