Computer backups are essential for safeguarding data against loss, corruption, or accidental deletion. There are several types of backups, each offering distinct advantages and uses. Each is used as a ‘insurance policy’ — if data is destroyed or erased; the backup of the data at a near time in the past can put the data back to nearly accurate to when the event occurred. This saves time and money reconstructing datasets.

The three main types of backups are:

1. Full Backup:
   • A full backup copies all selected data and files from a system to a storage device. It creates a complete copy of the entire dataset, providing comprehensive recovery capabilities.
   • Advantages: Offers complete restoration of data; simple and straightforward restoration process.
   • Disadvantages: Consumes more storage space and takes longer to perform compared to other backup types.
2. Incremental Backup:
   • Incremental backups save only the data that has changed since the last backup, whether it’s a full backup or an incremental backup itself. It backs up new or modified files since the last backup operation.
   • Advantages: Requires less storage space and shorter backup times compared to full backups.
   • Disadvantages: Restoration requires the last full backup and all subsequent incremental backups, making the process more complex.
3. Differential Backup:
   • Differential backups save data that has changed since the last full backup. Unlike incremental backups, they don’t require previous differential backups to restore data; only the last full backup and the latest differential backup are needed.
   • Advantages: Easier restoration process compared to incremental backups; faster restoration as compared to a full backup.
   • Disadvantages: Requires more storage space compared to incremental backups as the size of differential backups grows over time.