There are apps for backup android phone, tablet installed applications to a SD card or a computer. The main reason is copy applications apk files (Android Package files) are save bandwidth. If you use factory settings without modifications, you can’t install those backup.
For the security reasons android operating system does not allow install non-market applications. It’s not meant that, you can’t install backup package files on the SD. There is an option but user need to enable it.
Enable unknown source installation.
- Go to “setting> Application”.
- Check “Unknown sources”.
Install files on the SD card.
Use a file manager and browse the apk files location. Now tap on each files. In the installation window tap on the “Install” button and wait for a few seconds to complete the process. Now you are done.