Acronis Backup for Windows Server - User Guide - Manual (Page 100)

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will suspend the database and flush all caches to ensure that all transactions are completed; and
specify post-data capture commands that will resume the database operations after the snapshot is
taken.
About volume shadow copy writers
Before backing up the data of VSS-aware applications, make sure that the volume shadow copy
writers for those applications are turned on by examining the list of writers that are present in the
operating system. To view this list, run the following command:
vssadmin list writers
Note: In Microsoft Windows Small Business Server 2003, the writer for Microsoft Exchange Server 2003 is
turned off by default. For instructions on how to turn it on, see the following Microsoft knowledge base article
http://support.microsoft.com/kb/838183/.
Enabling VSS Full backup
The preset is: Disabled.
This option can be useful when you protect Microsoft Exchange Server with a disk-level backup (p.
193).
If enabled, logs of Microsoft Exchange Server and of other VSS-aware applications (except for
Microsoft SQL Server) will be truncated after each successful full, incremental or differential backup.
Leave this option disabled in the following cases:

If you use Acronis Backup Agent for Exchange or third-party software for backing up the
Exchange Server data. This is because the log truncation will interfere with the consecutive
transaction log backups.

If you use third-party software for backing up the SQL Server data. The reason for this is that the
third-party software will take the resulting disk-level backup for its "own" full backup. As a result,
the next differential backup of the SQL Server data will fail. The backups will continue failing until
the third-party software creates the next "own" full backup.

If other VSS-aware applications are running on the machine and you need to keep their logs for
any reason.
Enabling this option does not result in the truncation of Microsoft SQL Server logs. To truncate the
SQL Server log after a single-pass backup, enable the Log truncation setting in the Single-pass disk
and application backup section of the Create backup plan or Back up now page.