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My 1 TB Time Capsule drive is full with Time Machine backups. I'd rather spend $130 on a 3 TB drive than $500 on a new 3 TB Time Capsule.

Is an external drive attached to a Time Capsule supported for Time Machine backups? I have read that trying to use Time Machine with an Airport Extreme and an attached external drive is not supported and is in fact unreliable. Does that extend to Time Capsules with an external drive?

I realize that a Time Machine backup cannot be split across drives -- I would move entire backups to the 3 TB drive.

I bought my 1st generation Time Capsule (MB277LL/A) in 2008. I am running Mountain Lion.

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It is not officially supported. "Time Machine can’t backup to an external drive that's connected to an AirPort Extreme, Time Capsule, or a drive formatted for Microsoft Windows (NTFS or FAT format)." This is usually because of issues with the network file system not guaranteeing that writes have completed on disk before giving a "success" status.

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Thanks. Dangnabit. I can see how they would not be motivated to solve that problem ... –  Mark Adler May 27 '13 at 15:20
    
I don't understand the “network file system” explanation. –  Nicolas Barbulesco Oct 12 '13 at 16:59

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