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Chapter 3 Mail Service Advanced Conguration 81
6 To change a location, click the Edit (/) button below the Additional Mail Store
Locations box, edit the path to the new location, and click OK.
7 To remove a location, select the location to be deleted and click the Remove (-) button
next to the Additional Mail Store Locations box.
8 Click Save.
Maximum Number of Mail Messages Per Volume
Because Mail service stores each mail message in a separate le, the number of
messages that can be stored on a volume is determined by the total number of les
that can be stored on the volume.
The total number of les that can be stored on a volume that uses Mac OS Extended
format (sometimes referred to as HFS Plus format) depends on the following factors:
The size of the volume Â
The sizes of the les Â
The minimum size of a le, which by default is one 4 KB block Â
For example, a 4 GB HFS Plus volume with the default block size of 4 KB has one
million available blocks. This volume can hold up to a million 4 KB les, which means
it can hold a million mail messages that are 4 KB or less each. If some mail messages
are larger than 4 KB, this volume holds fewer of them. A larger volume with the same
default block size can hold proportionately more les.
Backing Up and Restoring Mail Messages
You can back up Mail service data by making a copy of the Mail service folder. If you need
to restore Mail service data, you can replace the Mail service folder with a backup copy.
You can back up individual mail storage folders or the entire mail store as needed.
One command line tool you can use to back up your mail messages is ditto.
See ditto’s man page for information.
Important: Before backing up or restoring the Mail service folder, stop Mail service.
If you back up the Mail service folder while Mail service is active, the backup mail store
might go out of sync with the backup folder. If you restore the folder while Mail service
is active, the active mail store might go out of sync with the active folder.
An incremental backup of the Mail service folder can be fast and ecient. If you back
up mail data incrementally, the only les copied are the message les that are new or
changed since the last backup.
After restoring the Mail service folder, notify users that messages stored on the server
have been restored from a backup copy.