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πŸ’Ύ 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 connection 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#

Backup 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

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