With iCloud enabled, there’s really nothing that you can lose. People have made sure their photos are available on all their devices, they’ve shared documents to the Cloud and also, most importantly, secured their data by uploading it to the cloud.
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iCloud also features quite many more interesting functions. For instance, you can transfer all your apps to a new iPhone via iCloud. Here’s a short tutorial on how to do that. How to Transfer Apps to a new iPhone via iCloud
Everyone knows that these days, Apple has allowed multiple-downloads of apps that you’ve purchased making it easy to recover apps that you accidentally deleted. Not only this, but apps that you’ve purchased for your iPhone can also be transferred to a new iPhone just in case you are setting up a new iPhone.
In order to do this, first, you must have iCloud enabled in your old iPhone where you have all your apps.
(Note: if your old iPhone does not have iCloud / does not support iCloud, you can’t follow these steps. iCloud is officially supported on iOS 5 or greater)
In Settings → iCloud → Storage and Backup → iCloud Backup → Switch it on.
If the recent backup is 24 hours old or more, you may click Back Up now. By default iCloud backs up every 24 hours if it’s connected to WiFi and power source.
And by default again, iCloud will backup everything from Mail, Calendars, Apps and App data. So there’s really no need to worry about this part.
Setting Up the new iPhone
When setting up the new iPhone, you will be asked to enter your iCloud details. When you enter your iCloud account details, all your data will be automatically downloaded and synced. If you’ve got apps, they will be downloaded too (as long as they’re available on the iTunes Store still).
That’s it. It’s pretty straight-forward, ain’t it?