Module 10. Data backup & Disaster recovery

 

DATA BACKUP & DISASTER RECOVERY

DEFINITION

Backup involves the creation of duplicate copies of important data and its storage on media storage devices such as CD/DVD, USB, external hard disks, Internet servers, cloud, etc. Data backup should be a priority in computer maintenance along with virus protection, as it is easy and inexpensive to back up data in comparison to recovering it after a disaster or system crash.

NEEDS FOR BACKUP
A data backup is like car insurance, it helps reduce damage if something goes wrong. Just as insurance protects against car theft or accidents, backups protect against data loss. Data loss is more common than expected and can result from accidental deletion, corruption, system crashes, theft, natural disasters, or malicious attacks.
ADVANTAGES
  • It ensures at least one copy of data survives accidents or natural disasters.
  • It's cost-effective since the cloud provider handles hardware purchase and maintenance.
  • Setup and installation are simple.
  • Data transfer security is managed by the provider, reducing user responsibility.
  • Recovery is quick and accessible from anywhere.
  • Users receive regular backup reports, helping them track and update their backups efficiently.
DATA
  • Data must always be permanently destroyed and not just deleted before discarding a hard drive.
  • Data backups must be taken at regular intervals
  • Data backups can be full, incremental, differential, or online in nature

TYPES OF DATA BACKUP
  • Full System Backup
  • Incremental Backup
  • Differential Backup
  • Online Data Backup:
    • Download and Install
    • Web based

REASONS FOR DATA LOSS
  • Reasons for data loss include human errors,
  • software failures,
  • computer viruses,
  • hardware malfunctions,
  • hardware thefts, and
  • natural disasters.



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