How does iphone5 back up text messages and memos?

Memos don't need to be backed up, as long as an apple id is automatically synchronized to iCloud, and short messages can be backed up by assistants on the computer.

I. Basic concepts

If the hardware or storage medium of the system fails, the Backup tool can help you protect your data from accidental loss. For example, you can use Backup to create a copy of data on your hard disk, and then store the data in other storage devices.

Two. usage mode

At present, the common backup methods are:

Back up data with tape regularly.

Remote tape library and CD library backup. That is, send the data to a remote backup center to make a complete backup tape or CD.

Remote critical data+tape backup. The production machine uses tape to back up data and sends key data to the backup machine in real time.

Remote database backup. Create a copy of the primary database on a backup computer that is independent of the production computer where the primary database resides.

Network data mirroring.

Remote mirror disk. Mirror disks are extended to places far away from production machines through high-speed Fibre Channel lines and disk control technology. The data of the mirror disk is exactly the same as that of the main disk, and the update mode is synchronous or asynchronous.

Data recovery must be considered in data backup, including adopting disaster prevention measures such as dual-machine hot standby, disk mirroring or fault tolerance, storing backup tapes in different places, and redundancy of key components. These measures can restore the system after a system failure. However, these measures can only deal with a single point of computer failure, and they are helpless to regional and devastating disasters and do not have the ability to recover from disasters.