Edit: After half day, my wife’s Mac started having the same problem. I have then applied the solution that I found in the Apple
How to Back Up Your Mac Mobile Device
Every one is aware as to how the data in Mac operating system be made a backup (time machine). But not much now about the process of keeping the information safe and secure in an iPad or iPhone. The launching of iOS 5 resolved the need to get connected to iTunes for creating synchronization among devices for the purpose of making changes or for simply installing updates and the device in use is the mobile device. In case, any malfunctioning occurs within your Mac mobile device and you need to move on to a new one, you cannot afford to move on at the cost of losing your data. There are two ways of performing this action – the iCloud technology and the iTunes application.
In order to use the first method, the iCloud technology, the first step is to create an account within it. To obtain one, the only requirement is associated with an Apple ID which is the same that is used to purchase and make downloads from the App stores and the iTunes library. An iCloud account that is free, offers 5 GB of space which is exclusive from iTunes purchases or the photo stream of the user. In order to start, you have to configure settings of the iCloud access on the Mac mobile device. An automatic backup system can also be made or the user can select to perform this process manually. The application will backup everything on it: the configuration of the device including wallpapers, the camera roll, messages including SMS, iMessages and MMS, the appearance of the device such as defining which application is appeared on which screen as well as all the ring tones and the person associated with ach ring tone. An automatic backup to the iCloud is permitted only when it is connected to the Wi-Fi signal, plugged into the power supply socket and the screen is locked. But such a situation occurs at that time when the device is kept to charge for a long time or overnight.
To create a backup through iTunes, connect the device to the operating system that is normally used for syncing purposes and upgrade the iTunes to its latest version available. Although, this process can be done with a previous version also but, the latest version will generate more efficient results. Trace out the device connected on the left-hand side of the screen and right click before selecting backup. This action will save application settings, camera rolls, wallpapers, contacts, notes, MMS and SMS messages and the call history if the backing up device is an iPhone.
Moreover, the data can be restored from the backup by using the set up assistant feature on the iOS 5 devices. The user can select to restore data from an iCloud backup or from the backup of iTunes. For all those devices that do not support iOS 5, data can be restored via the iTunes in the similar way which was used to create the backup – right click on the device located on the left-hand menu and select restore option from the backup.