Confused about transfer
I have an Iphone 5C - 16 gig and an Ipad 4 - 32 gig. I have 20GB of iCloud Storage and I have 17.1 available. I back up my phone and my iPad every night. What I find confusing is - 32 + 16 = 48. I only have 20 GB storage so how can I be backing everything up and still have 17.1 available?
When I look at my iPhone storage it says Used: 8.3GB. Available: 3.9 GB. (I just deleted some photos). In iCloud It says "Latest Backup - 364MB". Does the phone only back up CHANGES since the last back up? Is that why the backup is so small? A lot of my info. is synced with my iPad. I use the same login and password for both. Everything that is "syncable" is synced. Is this the explanation?
The reason I ask this is because I am planning to get a new phone in the next month or two. I have health information in an app on my phone. The app is not available for the iPad. I want to make sure all the information transfers to the new phone. If I have that particular app set to back up, will the whole app AND the information transfer over to my new phone when I set it up? It's important to me because I need the past information together with new information to record changes.
Someone at the phone store told me that I would have to go to the App Store and Purchased and then download all the apps again, using my old phone so that I could see OPEN so I knew that of all those numerous apps, the ones with OPEN were the ones I kept. The ones with the little cloud - were apps I deleted.
I have tried backing up my iPhone to my PC and the only things that backed up were: Music, Photos, Tones (and something else I can't remember). Why didn't it back up 100 percent of what is on my phone?
I am not going to buy a phone until I understand all this. If my iTunes would back everything up - then I would use that backup.
iPhone 5c, iOS 9.2.1, 16 GB