About configuring Exchange Single Instance
Store backups (Exchange 2007 and earlier)
Exchange Server 2007 and
earlier uses the Single Instance Store (SIS) to maintain
single-instance storage of mail messages. This capability in
Exchange Server allows the database to keep one copy of a message
sent to multiple users on the same server.
Note the following:
-
This feature is only available for MAPI mailbox
backups, not for snapshot backups or any backups that use Granular
Recovery Technology (GRT).
-
Only attachments larger than 100 KB are backed up
as SIS objects. Attachments smaller than 100 KB are backed up with
each individual message.
