Although Apple’s release notes for its Wednesday updates don’t mention adding the ability for Time Machine to back up to a USB drive attached to an AirPort Extreme 802.11n Base Station, numerous users reported that the feature had been added, and Macworld can confirm those reports in our testing on an AirPort Extreme 802.11n Base Station with Gigabit ethernet.
Although some users reported that their USB drives worked right away, in our testing we found that the external drive needed to be attached to a Mac and either formatted as Mac OS X Extended (Journaled) or verified and repaired using Apple’s Disk Utility program .
After the drive is reset, users should plug the disk back into the base station’s USB port, then mount the disk in the Finder.
Once the disk is mounted, users can open the Time Machine Preference Pane and click Choose Disk. The newly formatted USB drive will now be available as a Time Machine backup disk.
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