💾 Backup Methods

- Onsite
- Offsite
- Cloud

Onsite

• Complete and stored at the same site as the primary data source
• Backup media will include magnetic tape, external hard drives, servers, NAS

Advantages

• Immediate access to data
• One time cost
• Internet access not needed

Disadvantages

• Fire/theft - This option cannot help
• Hardware failure will loose all data

Offsite

This is a copy of the businesses production system. Data that is stored in a geographically different location than the production system.

Advantages

• Protection against disaster at business premisies
• Protection against primary site cyberattcks

Disadvantages

• Slow recovery time
• Cost / management

Cloud backups

Data is backed up in the cloud. It uses virtualisation

Advantages

• Cost effective, no site management
• Easy to scale

Disadvantages

• Slow recovery time
• Internet conenction dependent

3-2-1

Always have 3 copies of you data (your production data and two backup copies)
Have the backups on two different media (disk and tape)
With one copy offsite, for disaster recovery

Methodologies

Full

Makes a copy of all data to another set of media.

Advantages

• All data is backed up
• Straightforward to restore

Disadvantages

• Time consuming
• Storage space

Incremental

Only copies data that has changed since the last backup of any time

Advantages

• Less sorage required than differential backup
• Quicker to backup

Disadvantages

• More time to restore as all previous backups have to be restored

Differential

Only copies data that has changed since the last full backup.

Advantages

• Less storage required than full backup
• Quicker to restore than full backup

Disadvantages

• Stores more data than an incremental backup
• More space required than incrememntal backup