Apple released OS X Server 2.21 on Monday with improved support for managing Time Machine backups and Mac App Store downloads. OS X Server is an add on package for OS X Mountain Lion that adds server features.
OS X Server gets a maintenance and security update
Version 2.21 added Time Machine service monitoring, improved caching for Mac App Store downloads, added Active Directory groups to Profile Manager, added Retina Display support to Wiki Server, corrected a setup failure issue related to SSL errors, fixed a Profile Manager problem where uploaded apps could be accidentally deleted, and more.
The update also included security fixes that addressed Ruby on Rails issues that could allow arbitrary code execution in Profile Manager and Wiki Server.
OS X Server for Mountain Lion 2.21 is a free update and is available through the Mac App Store's Update feature.