Cyrus Backups server process


backupd [ -C config-file ] [ -U uses ] [ -T timeout ] [ -D ]
    [ -s ] [ -N ] [ -p ssf ]


backupd is the Cyrus Backups server. It accepts Cyrus replication protocol commands on its standard input and responds on its standard output. It MUST be invoked by master(8) with those descriptors attached to a replication client connection, typically sync_client(8).

backupd reads its configuration options out of the imapd.conf(5) file unless specified otherwise by -C.

backupd is generally configured to run on a dedicated backup server, containing backup storage, but no IMAP service or mailbox storage.

You must configure at least one backuppartition. User backups will be distributed among the configured partitions. Note that there is no relationship between mailbox partitions and backuppartitions.

If the directory log/user exists under the directory specified in the configdirectory configuration option, then backupd will create protocol telemetry logs for sessions authenticating as user. The telemetry logs will be stored in the log/user directory with a filename of the backupd process-id.


-C config-file

Use the specified configuration file config-file rather than the default imapd.conf(5).

-U uses

The maximum number of times that the process should be used for new connections before shutting down. The default is 250.

-T timeout

The number of seconds that the process will wait for a new connection before shutting down. Note that a value of 0 (zero) will disable the timeout. The default is 60.


Run external debugger specified in debug_command.

-p ssf

Tell backupd that an external layer exists. An SSF (security strength factor) of 1 means an integrity protection layer exists. Any higher SSF implies some form of privacy protection.


backupd is commonly included in the SERVICES section of cyrus.conf(5) like so:

    backupd        cmd="backupd" listen="csync" prefork=0