💾 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
Mirror#
A mirror backup is an exact copy of the selected folders and files from the source being backed up. Mirror backups are unique in that when you delete a file from the source, that file will eventually be deleted on the mirror backup. They’re also the fastest backup method because it copies files and folders to a separate storage center without compressing anything.
Real time backup of everything.
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