7.5 Digital environments

• Digital resilience involves what 4 main things:

  Understanding the risk of a digital environment

  Ability to identify problems

  Ability to recover from problems

  Implementing solutions to reduce future problems, or mitigate their effects
• Strong digital resilience is when an organisation can manage a risk whilst providing consistent service
• Data redundancy is often done by following the 3,2,1 rule. It is where 3 instances are held, across 2 devices, with one at a different location
• System backups backup all data including OS and settings
• There are three forms of hardware redundancy:

  Dynamic - one system is in use at a time

  Static - systems run in parallel comparing to eachother constantly

  Hybrid - both dynamic and static ad-hoc
• Incremental backups are where data that has been changed is updated to match the changes
• There are 3 types of disaster recovery site:

  Hot

  Warm

  Cold
• A cold site is the cheapest form of disaster recovery site -

  Takes longer to get back up and running

  Cheaper

  Just a data center
• A hot site is a replica of the original system -

  Stored at different location

  Identical hardware ,software, etc

  Very quick to get system running again

  Expensive
• A warm site is a hot site, but doesn't start with the business data already on it.

  It takes longer to set up than hot site

  Cheaper than a hot site
• A differential backup is where a full backup is taken and then it will be backup any data not in the original backup on a scheduled basis.
• What is the difference between an incremental and differential backup

  Incremental will backup a change from the last backup, differential will backup any change from the base backup
• A mirror backup is not just a backup of data, what else is backed up?

  The entire system
• Device hardening is what?

  Any methods used to reduce means of attack