Does iTunes backs up all your data when a new iPhone is connected?

I plugged my iPhone into someone else's macbook in order to charge it and the macbook was in their hands I couldn't see its screen.

But my iPhone was in my hands; is it possible that their iTunes might copied all my photos and data onto their Macbook?!

It is sync with the the ones YOU order to and if you need to copy something is manually into other than yours itunes

  • Is your data connected to your iTunes? So I have a iPod touch now (4th gen) and I want to get a iPhone 5c soon for my birthday. I don't want to get a iCloud thing because that is too much work for me and I don't really need it. So can I sync my pictures and notes and apps and music (which obviously is already on my iTunes) to my iTunes, and them when I get my iPhone, come home and sync it to that iTunes account? If so, can I easily sync everything to iTunes?
  • My iphone says i'm connected to Wi-Fi but when i try to run something it says i'm not connected? My phone shows signal, it has a check mark by the device but when i try to open an app it says can't find a connection.
  • Leaving your 4G on your iPhone 4s at all times won't waste your data right? I leave it on all the time and my plan is 300 MB and I was wondering if I had this on at all times and I don't use the web or anything I just leave my phone alone, it doesn't waste my data right? Very much appreciated!
  • If you update your iPhone 4S to 6.0.1 through Wi-Fi, does it erase all your data? I have updated to 6.0 before on my laptop in iTunes, but strangely it didn't erase all my data, so I didn't have to back up. I didn't see it automatically back up during the process of updating, so I was wondering if it would erase all my iPhone data if I updated it through Wi-Fi. A few months before, when I updated to 5.1.1 it erased all my data. I'm not sure if Apple did anything to 6.0 that made it not erase my data…