Updating multiple machines to Yosemite We have about 10 Mac Minis in the office. All are running Mavericks. I want to update them all to Yosemite but each downloading the 5GB update seems a bit inefficient.

Is there any way to download Yosemite once and somehow get this onto each of the minis?
On one machine download Yosemite from the AppStore.  When the Yosemite installer pops up you can quit that.  Go to Applications-->Install OS X Yosemite.app and copy the installer app. Then copy the installer to the other minis using your preferred local distribution method (ex. flash drive, ARD, cmd line).