Keyterm - There is a need to keep data safe from accidental damage, including corruption and human errors.

Activity 1 - research ways that data can be lost?

Data loss:

• Human error (Ronny says) - data entry error (data verification; validation checks); overwriting files.
• Hardware failiure - example damaged hard drive
• Power failiure
• Malware
• Physical causes - natural disasters; water damage; fire
• Physical loss (misplacing portable storage media)
• theft - physical therft (virtual hacking) of a computer.

DATA back-up

Backup storage media:

• Magnetic media - HDD - magnetic tape (cheapest per megebyte storage)
• Optical storage - CDs; DVDs; Blu-ray
• Cloud storage - easy access - automatic backup

Backup schedule

Two methods of computer security (p127):