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What is a backup?

In information technology, backup refers to making copies of data so that these additional copies may be used to restore the original after a data loss event. These additional copies are typically called "backups". Backups are useful primarily for two purposes. The first is to restore a state following a disaster (called disaster recovery). The second is to restore small numbers of files after they have been accidentally deleted or corrupted. Data loss is also very common. 66% of internet users have suffered from serious data loss. So the backup is a very important task for the computer users.

The types of the backup

There are actually three different types of backup: full backup, differential backup and incremental backup.

Full backup is the simplest form of backup. It is a backup of every file on a file system, no matter the files have been changed or not. So it is the most time-consuming, space-intensive and the least flexible backup. However, full backup provides the quickest restore time.

Differential backup backs up only the files that changed since the last full back. Though differential backup is quicker than full backup, yet the amount of data will become large with each differential backup until the next full back up.

Incremental backup only backs up the data that has changed since the last backup - a full or incremental backup. Incremental backup is the fastest backup and requires the least storage space on the backup media.

Free backup software

EaseUS Todo Backup Free is free for home and business users. It supports Windows 2000/XP/Vista/7 and provides many advanced functions, such as:

• File and folder backup: backs up specified files, network shared files, files in use, folders or file types in case of virus attack, hard disk failure, or deletion by accident, etc.
• Incremental backup: backs up the changed data since the last backup to save time and space.
• Backup schedule: schedules a backup task to let your system and important data be backed up daily, weekly or monthly automatically.
• Recover to dissimilar hardware: simplifies system migration by the way of restoring system to dissimilar hardware configuration.