This appeared in error.log after restarting the mini:
2012-08-07 23:10:57+0200 [-] Log opened.
2012-08-07 23:10:57+0200 [-] twistd 12.0.0 (/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/ Contents/MacOS/Python 2.7.2) starting up.
2012-08-07 23:10:57+0200 [-] reactor class: twext.internet.kqreactor.KQueueReactor.
2012-08-07 23:10:57+0200 [-] AMPLoggingFactory starting on '/var/run/caldavd/caldavd.sock'
2012-08-07 23:10:57+0200 [-] CalDAVStatisticsServer starting on '/var/run/caldavd/caldavd-stats.sock'
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaService#warn] Beginning database schema check.
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaService#warn] Required database key VERSION: 9.
2012-08-07 23:10:58+0200 [-] [memcached-Default] failed to listen on TCP port 11211: Address already in use
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaService#warn] Actual database key VERSION: 9.
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaService#warn] Schema version check complete: no upgrade needed.
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseSchemaService#warn] Database schema check complete.
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseDataService#warn] Beginning database data check.
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseDataService#warn] Required database key CALENDAR-DATAVERSION: 3.
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseDataService#warn] Actual database key CALENDAR-DATAVERSION: 3.
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseDataService#warn] Data version check complete: no upgrade needed.
2012-08-07 23:10:58+0200 [-] [txdav.common.datastore.upgrade.sql.upgrade.UpgradeDatabaseDataService#warn] Database data check complete.
2012-08-07 23:10:59+0200 [-] LimitingInheritingProtocolFactory starting on 8008
2012-08-07 23:10:59+0200 [-] LimitingInheritingProtocolFactory starting on 8800
2012-08-07 23:10:59+0200 [-] LimitingInheritingProtocolFactory starting on 8443
2012-08-07 23:10:59+0200 [-] LimitingInheritingProtocolFactory starting on 8843
2012-08-07 23:10:59+0200 [-] LimitingInheritingProtocolFactory starting on 8008
2012-08-07 23:10:59+0200 [-] LimitingInheritingProtocolFactory starting on 8800
2012-08-07 23:10:59+0200 [-] LimitingInheritingProtocolFactory starting on 8443
2012-08-07 23:10:59+0200 [-] LimitingInheritingProtocolFactory starting on 8843
2012-08-07 23:10:59+0200 [-] [memcached-Default] failed to listen on TCP port 11211: Address already in use
2012-08-07 23:11:00+0200 [-] [notifications] 2012-08-07 23:11:00+0200 [-] Log opened.
2012-08-07 23:11:00+0200 [-] [notifications] 2012-08-07 23:11:00+0200 [-] twistd 12.0.0 (/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/ Contents/MacOS/Python 2.7.2) starting up.
2012-08-07 23:11:00+0200 [-] [notifications] 2012-08-07 23:11:00+0200 [-] reactor class: twext.internet.kqreactor.KQueueReactor.
2012-08-07 23:11:00+0200 [-] [notifications] 2012-08-07 23:11:00+0200 [-] AMPPushNotifierFactory starting on 62311
2012-08-07 23:11:00+0200 [-] [notifications] 2012-08-07 23:11:00+0200 [-] InternalNotificationFactory starting on 62309
2012-08-07 23:11:00+0200 [-] [notifications] 2012-08-07 23:11:00+0200 [-] set uid/gid 93/93
2012-08-07 23:11:00+0200 [-] [notifications] 2012-08-07 23:11:00+0200 [-] Starting factory <twext.internet.adaptendpoint.LegacyClientFactoryWrapper instance at 0x10a181128>
2012-08-07 23:11:00+0200 [-] [notifications] 2012-08-07 23:11:00+0200 [-] Starting factory <twext.internet.adaptendpoint.LegacyClientFactoryWrapper instance at 0x10a181368>
2012-08-07 23:11:00+0200 [-] [groupcacher] 2012-08-07 23:11:00+0200 [-] Log opened.
2012-08-07 23:11:00+0200 [-] [groupcacher] 2012-08-07 23:11:00+0200 [-] twistd 12.0.0 (/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/ Contents/MacOS/Python 2.7.2) starting up.
2012-08-07 23:11:00+0200 [-] [groupcacher] 2012-08-07 23:11:00+0200 [-] reactor class: twext.internet.kqreactor.KQueueReactor.
2012-08-07 23:11:00+0200 [-] [groupcacher] 2012-08-07 23:11:00+0200 [-] set uid/gid 93/93
2012-08-07 23:11:00+0200 [-] [groupcacher] 2012-08-07 23:11:00+0200 [-] [twistedcaldav.directory.directory.GroupMembershipCacherService#warn] Starting group membership cacher service
2012-08-07 23:11:01+0200 [-] [memcached-Default] failed to listen on TCP port 11211: Address already in use
2012-08-07 23:11:01+0200 [-] [mailgateway] 2012-08-07 23:11:01+0200 [-] Log opened.
2012-08-07 23:11:01+0200 [-] [mailgateway] 2012-08-07 23:11:01+0200 [-] twistd 12.0.0 (/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/ Contents/MacOS/Python 2.7.2) starting up.
2012-08-07 23:11:01+0200 [-] [mailgateway] 2012-08-07 23:11:01+0200 [-] reactor class: twext.internet.kqreactor.KQueueReactor.
2012-08-07 23:11:01+0200 [-] [mailgateway] 2012-08-07 23:11:01+0200 [-] HTTPFactory starting on 62310
2012-08-07 23:11:01+0200 [-] [mailgateway] 2012-08-07 23:11:01+0200 [-] set uid/gid 93/93
2012-08-07 23:11:01+0200 [-] [notifications] 2012-08-07 23:11:01+0200 [Uninitialized] [calendarserver.push.applepush.APNProviderFactory#warn] Connection to APN server made
2012-08-07 23:11:01+0200 [-] [caldav-2] Reading configuration from file: /Library/Server/Calendar and Contacts/Config/caldavd.plist
2012-08-07 23:11:01+0200 [-] [caldav-2] [-] Log opened.
2012-08-07 23:11:01+0200 [-] [caldav-2] [-] twistd 12.0.0 (/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/ Contents/MacOS/Python 2.7.2) starting up.
2012-08-07 23:11:01+0200 [-] [caldav-2] [-] reactor class: twext.internet.kqreactor.KQueueReactor.
2012-08-07 23:11:01+0200 [-] [notifications] 2012-08-07 23:11:01+0200 [Uninitialized] [calendarserver.push.applepush.APNProviderFactory#warn] Connection to APN server made
2012-08-07 23:11:01+0200 [-] [caldav-2] [-] set uid/gid 93/93
2012-08-07 23:11:01+0200 [calendarserver.accesslog.AMPLoggingFactory] AMPLoggingProtocol connection established (HOST:UNIXAddress('/var/run/caldavd/caldavd.sock') PEER:UNIXAddress(''))
2012-08-07 23:11:01+0200 [-] [caldav-2] [-] AMP connection established (HOST:UNIXAddress(None) PEER:UNIXAddress('/var/run/caldavd/caldavd.sock'))
2012-08-07 23:11:01+0200 [-] [caldav-1] Reading configuration from file: /Library/Server/Calendar and Contacts/Config/caldavd.plist
2012-08-07 23:11:01+0200 [-] [caldav-1] [-] Log opened.
2012-08-07 23:11:01+0200 [-] [caldav-1] [-] twistd 12.0.0 (/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/ Contents/MacOS/Python 2.7.2) starting up.
2012-08-07 23:11:01+0200 [-] [caldav-1] [-] reactor class: twext.internet.kqreactor.KQueueReactor.
2012-08-07 23:11:01+0200 [-] [caldav-1] [-] set uid/gid 93/93
2012-08-07 23:11:01+0200 [calendarserver.accesslog.AMPLoggingFactory] AMPLoggingProtocol connection established (HOST:UNIXAddress('/var/run/caldavd/caldavd.sock') PEER:UNIXAddress(''))
2012-08-07 23:11:01+0200 [-] [caldav-1] [-] AMP connection established (HOST:UNIXAddress(None) PEER:UNIXAddress('/var/run/caldavd/caldavd.sock'))
2012-08-07 23:11:01+0200 [-] [caldav-3] Reading configuration from file: /Library/Server/Calendar and Contacts/Config/caldavd.plist
2012-08-07 23:11:01+0200 [-] [caldav-3] [-] Log opened.
2012-08-07 23:11:01+0200 [-] [caldav-3] [-] twistd 12.0.0 (/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/ Contents/MacOS/Python 2.7.2) starting up.
2012-08-07 23:11:01+0200 [-] [caldav-3] [-] reactor class: twext.internet.kqreactor.KQueueReactor.
2012-08-07 23:11:01+0200 [-] [caldav-3] [-] set uid/gid 93/93
2012-08-07 23:11:01+0200 [calendarserver.accesslog.AMPLoggingFactory] AMPLoggingProtocol connection established (HOST:UNIXAddress('/var/run/caldavd/caldavd.sock') PEER:UNIXAddress(''))
2012-08-07 23:11:01+0200 [-] [caldav-3] [-] AMP connection established (HOST:UNIXAddress(None) PEER:UNIXAddress('/var/run/caldavd/caldavd.sock'))
2012-08-07 23:11:01+0200 [-] [caldav-0] Reading configuration from file: /Library/Server/Calendar and Contacts/Config/caldavd.plist
2012-08-07 23:11:01+0200 [-] [caldav-0] [-] Log opened.
2012-08-07 23:11:01+0200 [-] [caldav-0] [-] twistd 12.0.0 (/System/Library/Frameworks/Python.framework/Versions/2.7/Resources/Python.app/ Contents/MacOS/Python 2.7.2) starting up.
2012-08-07 23:11:01+0200 [-] [caldav-0] [-] reactor class: twext.internet.kqreactor.KQueueReactor.
2012-08-07 23:11:01+0200 [-] [caldav-0] [-] set uid/gid 93/93
2012-08-07 23:11:01+0200 [calendarserver.accesslog.AMPLoggingFactory] AMPLoggingProtocol connection established (HOST:UNIXAddress('/var/run/caldavd/caldavd.sock') PEER:UNIXAddress(''))
2012-08-07 23:11:01+0200 [-] [caldav-0] [-] AMP connection established (HOST:UNIXAddress(None) PEER:UNIXAddress('/var/run/caldavd/caldavd.sock'))
2012-08-07 23:11:05+0200 [-] [memcached-Default] failed to listen on TCP port 11211: Address already in use
2012-08-07 23:11:13+0200 [-] [memcached-Default] failed to listen on TCP port 11211: Address already in use
2012-08-07 23:11:29+0200 [-] [memcached-Default] failed to listen on TCP port 11211: Address already in use
2012-08-07 23:12:01+0200 [-] [memcached-Default] failed to listen on TCP port 11211: Address already in use