I followed this guide to make iTunes store my iPhone backups on my Time Capsule drive, which has free space to spare instead of my MacBook, which is low. However, when I run a backup now, I will get the following error message:
"iTunes could not back up the iPhone because an error occurred while reading from or writing to the iPhone." The backup process clearly writes to the disk as I can see the many GB worth of files reside in the correct place. So the symlink works for that, at least. It just fails on step 5 of 5 of syncing in iTunes, "waiting for changes to be applied". That's when the above error message is given. I have tried both doing a clean backup into the Time Capsule and relocating my current backup thereto and then doing an updated backup.
I suspect it may something to do with permissions so I also tried allowing Airport disks guest access using an older version of AirPort Utility (5.6) but it didn't help either. So does anyone know of a way to backup directly to the Apple Time Capsule? Thanks