Do I need a backup to upgrade my ios8 phone?

1, it is very necessary to make a backup before upgrading the mobile phone system. If you don't make a backup, such as telephone address book, photos, text messages, memos, etc. These files will be erased and overwritten during the upgrade process.

2. Mobile phone backup, you can use computer synchronous backup or iCloud cloud backup.

3. Computer synchronization means downloading and installing itunes files on the computer, and then connecting the computer itunes with the mobile phone. itunes will automatically scan the information on the mobile phone system. The content that can be backed up is limited. Ringtones, songs, videos, pictures, other short lines and address books cannot be directly backed up on the computer.

4. In addition to computer backup, it is to use the iCloud cloud function on the mobile phone for backup synchronization, open the mobile phone setting-iCloud, enter and open all functions of all related applications that need to be backed up and can be backed up synchronously, and then connect the mobile phone to the network. It may take some time to back up. After all the files are backed up, the mobile phone system can be upgraded.

5. After the mobile phone system is upgraded, log in with iCloud account to activate the new mobile phone system, and the mobile phone is connected to the network; Enter the settings, find iCloud, and then turn on the synchronization function of all data-related applications that need to be replied. It will take some time to recover. Finally, download the backup data synchronously on the new mobile phone system.