ZCS Administrator Guide 8.0
ZCS Administrator Guide 8.0
Network Edition


Backup and Restore > Backup Methods

Backup Methods
Two backup methods are available: .
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The standard backup method is appropriate for enterprise deployments where full backups are run during non-working days.
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The auto-grouped backup method is recommended for large ZCS environments where running a full backup of all accounts at one time would take too long.
Standard Backup
The standard backup method runs a weekly full backup and daily incremental backups. A full backup process backs up all the information needed to restore mailboxes, including the LDAP directory server, database, index directory, and message directory for each mailbox.
When backing up shared messages, if a file representing a message already exists in the backup, it flags this object as such and does not copy its content again.
An incremental backup process backs up the LDAP data and gathers all the redo logs written since the last incremental backup. If the incremental backup process finds no previous full backup for a mailbox, a full backup is performed on that mailbox.
Incremental backups move the redo logs to the backup directory. The redo logs are a journal of every activity that has taken place. They contain a full copy of all messages delivered, as well as metadata such as tags, contacts, and conversations.
These backup files can be used to restore the complete mailbox server or individual mailboxes so that account and message data is completely restored.
The LDAP directory is backed up as part of either the full or incremental backup process. All accounts, domains, servers, COS, and other data are backed up.
Each mailbox server generates redo logs that contain every transaction processed by that server. If an unexpected shutdown occurs to the server, the redo logs are used for the following:
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When the server is restored, after the backed up files are fully restored, any redo logs in the archive and the current redo log in use are replayed to bring the system to the point before the failure.
The Zimbra MTA is not backed up, as the data is only on the server for a very short time.
Custom configurations, such as mailboxd’s server.xml, are not backed up.
Backup Notifcation
A backup report is sent to the admin mailbox when full and incremental backups are performed. This report shows the success or failure of the backup and includes information about when the backup started and ended, the number of accounts backed up and redo log sequence range.
If the backup failed, additional error information is included.
Auto-Grouped Backup Method
The auto-grouped backup method runs a full backup for a different group of mailboxes at each scheduled backup. The auto-grouped backup method is designed for very large ZCS environments where backing up all accounts can take a long time. Because auto-grouped backups combine full and incremental backup functions, there is no need for incremental backups. Each auto-grouped session runs a full backup of the targeted group of mailboxes. It is not recommended to run auto-grouped backups manually since they are scheduled from the CLI and run automatically at the scheduled times.
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