This awful syncing behaviour is still happening in iOS7.0.3
From purchase, I have always had my iPad in iTunes set to "Manually Manage Music and Videos" and all "Sync" checkboxes turned off. It has only ever been associated with my desktop computer.
It has the following content:
Apps (downloaded on the iPad only)
Music, videos and PDFs (manually added via iTunes)
Recently I decided I wanted to change Books from manual to automatic syncing, leaving everything else manual.
So I set Books to "Sync All Books" (with the iTunes > Books folder on my PC). You'd think that would mean:
- Sync All Books from PC
- Leave Music and Videos to manual syncing
But no, syncing books turns off the "Manually Manage Music and Videos" option, like that makes any sense whatsoever.
So now all my music and videos have been deleted from my iPad. Just wonderful Apple, really stellar job.
It's quite simple, this is what your users want Apple:
To individually choose which media type(s) to automatically sync or manually manage. So:
1) Get rid of the "Manually Manage Music and Videos" option on the Summary screen, it's misleading. Or rename it to what it actually does.
2) When a user clicks a "Sync" checkbox, mark that for automatic syncing based on whether to user wants all or selected items, then when syncing, sync those and ONLY those items checked. Everything else leave to MANUAL.
I don't expect Apple to do anything about this, as usual, they know best.