Apple has updated the combo updater for Mac OS X Server 10.6.3. Although Apple provided no details on what was changed, the only users who need to consider installing it are those who updated from Mac OS X Server 10.6.0 using the 1.0 version of the Mac OS X Server 10.6.3 Combo Update, build 10D573 (in other words, someone reinstalling Snow Leopard Server from scratch and then updating to 10.6.3 in one step). The combo updater is available via the Apple Support Downloads page, and will be presented by Software Update to those reinstalling Snow Leopard Server from scratch. (Free, 897.32 MB)
Single Time Machine Backups
Tired of Time Machine running all the time? You can turn it off in the Time Machine preference pane, but still initiate a single backup by choosing Back Up Now from Time Machine's menu bar icon. Of course, your backup is much less likely to be up to date, but Time Machine won't be taking any resources while you're trying to work.