Time Machine - Troubleshooting C4. "The backup disk is full" or ". . . almost full" or "This backup is too large . . ."

http://pondini.org/TM/C4.html

Mac OS X Server: How to reset the Open Directory administrator password

http://support.apple.com/kb/HT1194

Users suddenly unable to write (Error 400 CalDAVWriteEntityQueueableOperation ) - A discussion list for users of the Apple iCal Server - ArchiveOrange

http://web.archiveorange.com/archive/v/WEASlBuGVdEwy5zaXJN6

Time Machine - Troubleshooting

http://pondini.org/TM/Troubleshooting.html