I'm trying to set up time machine to back up on an external HD connected t my airport extreme, but the disk doesn't show as an option in the time machine selecting a disk, any suggestion anyone? My mac "sees" the airport extreme   ??

I'm trying to set up time machine to back up on an external HD connected t my airport extreme, but the disk doesn't show as an option in the time machine selecting a disk, any suggestion anyone? My mac "sees" the airport extreme   ??

The first important thing to consider here is that Apple does not support Time Machine backups to a drive at the USB port on the AirPort Extreme, so that may likely have something to do with your difficulties.
If you want to continue to try this, the drive must be formatted in Mac OS Extended (Journaled) and you almost always have to use a powered USB hub with a drive at the port of the Extreme...even if the hard drive has its own power supply....because the port on the Extreme is under powered.
Most users who try this unsupported method have corruption difficulties sooner or later, but we do hear from some users who seem to be able to make it work.
The bottom line is that there is no support from Apple on this if you have difficulties, so you may want to consider a secondary backup plan for your important data.

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