AppAssure performs Exchange log truncation by calling a full VSS shadow copy backup. This process calls all VSS writers including the Exchange Writers. Exchange Writers coordinate with the Exchange services (operating on behalf of the requestor) to prepare the database files for backups, freeze the IO activity resulting from Exchange transactions before backing up the database, and then to unfreeze and truncate log files after the backup is complete to quiesce the application data to disk (http://msdn.microsoft.com/en-us/library/bb204080(v=exchg.140).aspx). If AppAssure is able to successfully call a full shadow copy backup and complete the backup of data to AppAssure successfully, then AppAssure will consider log truncation performed and will update the Exchange log truncation counters in the core web UI. This update will happen regardless of whether any logs were truncated or not.
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