I use File Expert for app backup. Enter the app-My Files tab-Apps-Select the apps you want to backup-Choose Back up to Cloud or Local. Very easy and fast.
Many file manager can help you with that. You can copy,cut,paste,rename, zip files on your phone with the help of File Expert, which I installed on my Android device. Easy and useful!
You can turn to a wireless file transfer app for help, e.g., Web PC Suite. After connecting your phone with a computer, you can upload and download files from Android to pc. Easy and fast.
Try downloading the files to your computer, connecting your Android phone via USB cable, and using a downloadable utility like ANDROID FILE TRANSFER to transfer the file to your phone.
Use the computer
Framaroot is an application that will allow you to root your phone without a computer.
You can use the wifi or use QQ
The Galaxy S3 is an amazing piece of technology that can handle any task without a problem. Capable of taking HD pictures and video, connecting with 3g, 4g, wifi, bluetooth and act as a hub, this phone will replace a lot of your time at your computer.
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You can do it by a file management app, e.g., File Expert.Enter the app-My Files-Apps-Select the apps you want to backup-Click an clock-like icon-Choose to backup to Gcloud or local-Done.Hope it helps.
You can put music on an android by simply connecting your phone to a PC. Then copy paste MP3 or MP4 music to the mail folder.
You can try Web PC Suite, an app for wireless connection between Android phone and pc/laptop/tablets. 1.Connect your Android phone with a laptop or tablet. 2.Click Music icon and play your music or video on your phone by web browser. 3.Done! So easy!