How to sync two time capsules?

Sorry, but Apple does not provide the means to do this.

Even if they did, you run the risk of having a corrupted file on one Time Capsule corrupting the file on the other Time Capsule.

The best that you can do using Apple software is have a Mac or Macs back up to each Time Capsule, so you have backups of multiple Macs on two different Time Capsules.

In theory, you could have another application like Carbon Copy Cloner or SuperDuper backup Time Capsule 1 to Time Capsule 2, but the same risks apply.. I haven't tried this....and won't....but maybe another user has.

In theory, you could have another application like Carbon Copy Cloner or SuperDuper backup Time Capsule 1 to Time Capsule 2, but the same risks apply.. I haven't tried this....and won't....but maybe another user has.

Agree with Bob.. what you can do and what you should do are different. It is possible to use CCC and put the two TC in sync. The result will still be only as good as the quality of the first disk. That is a very slow way to backup.. TC is not designed as a NAS so it has no internal ability to sync files. It is purely designed as a target for Time Machine.

If you do use CCC all packets are copied via the computer.. over the network.. so if you use wireless expect to never finish.. before the next TM backup starts and CCC will still be syncing.. ie you will have created an endless loop. Don't do it.