Backup – On-Site
A backup is a copy of some or all data, applications and operating systems. A local backup (On-Site).
On-Site (Local) Backup
Advantage of a local back is that both the backup and restore quick. It is recommended that an “Off-Site or Location” copy be rotated around providing cover against a disaster.
Why should I do a backup
Backups are usually done for one of the following reasons:
- Prevent data loss if there is a disaster
- Fire, hardware or Software failure
- An intentional or unintentional deletion
- Computer viruses, malware or other programs that makes the data unusable/corrupted
- There is a logical/programming error in the data
- Sudden computer shutdown which can be caused by power shortage
Types of backup
- Normally a complete backup of all Data, Applications and Operating System which means that if the main copy of the data is lost, you can just copy the data back from the backup.
Selective Full would normally be just Operating System or Applications or Data.
Differential and Incremental
- Differential backups copy all the data since the last Full backup whereas Incremental backups copy all the data since the last Incremental.
Basically this is the amount of time your wish to retain copies of your data so that you can restore if you have a problem.