Using Time Machine with an Airport Extreme AirDisk

P4.  "Backup volume could not be mounted"

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You may get this message after changing a network volume's password.

If the password has been changed since Time Machine was configured, you may not be able to back up to it.

See this Apple article:  Mac OS X 10.5.3 or later: Time Machine - "Backup volume could not be mounted" after changing network volume's password

Time Machine can back up to a USB drive
connected to the new, tall Airport Extreme "ac" models (6th generation) introduced in June, 2013.

But it's not reliable and not supported by Apple on the older, flat models.  They have different hardware.  If there's trouble with it, you won't get much, if any, help from Apple.  If you decide to take the risk, you'd be well advised to have other backups;  don't depend on these 100%.   See Time Machine FAQ #2 for supported Time Machine destinations.