When the new Airport Extreme Base Station came out, I was happy to see that it had some support for attached USB drives. It's a reasonable (though not perfect) way to share data in a home/SOHO situation, and I figured people would be using it to back up with SuperDuper! So -- to help out...

General Comments

A few things to point out right off the bat:

  • As you've likely seen elsewhere, the Airport Disks are not fast. Don't expect blazing speeds: wired, I've seen a maximum of about 1.5MB/s.

  • The AEBS gets very, very cranky if you get to a disk full situation. I've seen it crash more than once. Don't do that.

  • Remember that HFS+ drives are made available through AFP, and FAT32 through SMB.

    Don't format any drives you're going to use with SuperDuper! as FAT32: use HFS+ (and partition properly for the Mac processor type you're using -- GUID for Intel, Apple Partition Map for Power PC).

  • Make sure to connect a power supply to the drive.

  • As general advice, please don't cheap out when you get an external drive. Really. Get one with a real Oxford chipset, USB/FireWire if possible in case you want to attach it directly to your Mac.

  • Don't expect miracles. This is an inexpensive solution, and it behaves like one. If you want a real NAS, I suggest an Infrant ReadyNAS NV+: it's faster, redundant, recoverable. I'll have another post about the ReadyNAS soon.

  • Remember, this is a first generation ("Rev A") product. It's likely to go through teething pains. Don't rely on them as your only backup!

Using Airport Disks with SuperDuper!

You'll note that your Airport Disks don't show up in the SuperDuper! pop-ups. This is by design: we can't currently copy directly to or from a network volume due to authentication/permission/metadata issues.

Instead, you'll follow the steps in Backing up over a network in the SuperDuper! User's Guide (Help > User's Guide), and back up to a read/write sparse image stored on the Airport Disk.

We often get asked why SuperDuper! can't back up directly to a network volume. What most people don't realize is that, for security reasons, you can't directly authenticate as "root" over a network, and that means it's not possible to store files with system ownership on a network drive.

An image, on the other hand, acts as a "local drive", and can be authenticated against, even though it's stored remotely. This ensures that your files are backed up with full fidelity, including proper ownership and permissions. And since it's formatted as HFS+, it avoids various situations that can ensue trying to emulate HFS+ semantics and metadata storage on a non-HFS+ drive, while still storing in a native, non-proprietary, Mac-native format.

I'd suggest doing your first full backup directly to the USB drive, rather than over the network. This'll be a lot faster. You can then connect the drive to the base station, and re-select the image using the "Disk Image..." choice in SuperDuper!'s destination drive pop-up. (Note that although the image will be grey, you can still pick it, and ignore the "overwrite" warning. Yes, I know that UI sucks.)

That should do it: enjoy the base station!