💾 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
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