Acronis Recovery for Microsoft Exchange - User Guide - Manual (Page 48)

This parameter is selected by default, which allows backing up metadata.
3. Overwrite data on the tape
Select this parameter if you use tapes as a backup location and want to choose an
overwrite mode. See 5.1.9 for detailed information.
4. Fast incremental backup
Select this parameter to create only brick-level (document level) backup, which
provides quicker restoring of individual e-mails and mailboxes.
5. Do not truncate transaction logs
This parameter is available only while backing up information stores and storage
groups will be enabled only if you create independent full backups (Acronis Recovery
for MS Exchange will check the specified backup strategy). This parameter is selected
by default.
In all other cases Acronis Recovery for MS Exchange will truncate transaction logs,
since creating an archive chain (full and incremental backups) is impossible with
transaction logs not truncated after the first full backup.
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