When you start a backup you have to
select what type of backup you want to perform. According to your device
there could be multiple options to choose from.
In the case of Android you can select
basic MOBILedit backup (which can backup contacts, messages, calendar,
files) or Android backup. This backup can be restored only
into Android device.
Please note that MOBILedit backup cannot be used to restore applications
You can also choose the raw ADB (Device) backup of your phone. This will be saved as a .AB file and can be restored using an ADB command below
adb restore <location of your backup>
If your phone is iPhone then you can select basic MOBILedit
backup or you can create an iTunes backup using MOBILedit.
information see iTunes backup section.