Interference or not, that's a lame excuse. Anything wireless will experience interference, and that's life.

The hardware/software protocols, journaling, etc. have to be done in such a way as to simply retry, continue after the drop out, or gracefully fail.

I just got a TimeCapsule, too, and even without any visible drop out (if so, it was just fractions of a second), it failed during the backup, and now I can either wipe the TimeMachine backup image or stick with the inconvenience of having an external drive hooked up to my laptop for backup purposes.

I experimented with the unofficial hack that allows AirPort Extreme base stations with external drives to serve as backup targets, but unfortunately, TimeCapsule isn't doing any better that that undocumented solution.

Conclusion: wireless TimeMachine backup isn't ready for prime-time. And for the money, Apple would better put a decent CPU into an appleTV, and then have a home version of Mac OS X Server running on it: software base station, backup/file server, and media server. After all, if you look at the things MacMini, appleTV and TimeCapsule share, you realize that for not that much more money than any of these, you could have an all-in-one solution in the home, rather than an assortment of items that are one-trick ponies and which then still fail at what they are supposed to do.

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I completely agree.

It just falls into the usual, wait til rev3 of any Apple product theory. But to have the reason be mixed mode and interference is just bad. Then again, I've had an Airport Express for a few years, and honestly, I've only used it 2x at parties where there actually were no devices other than cell phones around.....at home it just doesn't cut it with drops happening before the first song can finish.

If a simple audio streamer doesn't work, I just don't have faith in a wireless backup solution from Apple.

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I have a new Time Capsule and found the wireless works great for incremental backup. For the first large backup I connected to it via ethernet cable, turned off Airport and did the backup. It only took little over an hour this way. After that I turned Airport (on my Mac) and let Time Capsule do its thing after that. It works great that way! No problems so far and it's cool that my MacBook updates the backup while sitting at my couch watching a long movie (with family members).

Then for regular file storage I mounted the disk and put it into my Login Items for restarts. It works great that way.

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