Post on 22-Dec-2015
1AQA ICT AS Level © Nelson Thornes 20081AQA ICT AS Level © Nelson Thornes 2008
Backup and its importance
2AQA ICT AS Level © Nelson Thornes 20082AQA ICT AS Level © Nelson Thornes 2008
What do we mean by backup?• A backup is simply an extra copy of the data from
a computer system.• If data becomes corrupted or is stolen, it can be
restored from the backup copy.• A backup and recovery strategy is needed to
plan how data is backed up and how it will be recovered.
• A recovery strategy may also include sourcing hardware and office space.
Backup and its importance
3AQA ICT AS Level © Nelson Thornes 20083AQA ICT AS Level © Nelson Thornes 2008
“Of companies that had a major loss of computerised records, 43% never re-open, 51% close within two years and only 6% will
survive long-term.”
Jim Hoffer, "Backing Up Business - Industry Trend or Event",
Health Management Technology, Jan 2001
Backup in business
4AQA ICT AS Level © Nelson Thornes 20084AQA ICT AS Level © Nelson Thornes 2008
Common reasons for data loss• Human error• Hardware or software malfunction• Criminal activity• Natural disasters
Threats to data
5AQA ICT AS Level © Nelson Thornes 20085AQA ICT AS Level © Nelson Thornes 2008
Earthquake – Los Angeles 1994
Floods – Gloucestershire, UK 2007
Terrorism – City of London 1993
Natural disasters account for only 2% of loss.
Natural or man-made disasters
6AQA ICT AS Level © Nelson Thornes 20086AQA ICT AS Level © Nelson Thornes 2008
• Magnetic tape• Hard disk• Optical disk• RAID• Remote backup service
These are the main types of backup media that you need to know about.
Click on the links for more information.
Click here to continue.
Backup media
7AQA ICT AS Level © Nelson Thornes 20087AQA ICT AS Level © Nelson Thornes 2008
Removable flash drive
CDR or DVDR Disk
These media are suitable for backing up home computers or for small business use.
Click here to return to list of backup devices.
Backup media
Removable hard disk
8AQA ICT AS Level © Nelson Thornes 20088AQA ICT AS Level © Nelson Thornes 2008
Hard Disk
These media have large capacities and can be stored away from the main computer.
A hard disk in another location can be used for backup.A laptop can be transferred and backed up to the user’s desktop computer hard disk.
Backup media
Click here to return to list of backup devices.
9AQA ICT AS Level © Nelson Thornes 20089AQA ICT AS Level © Nelson Thornes 2008
RAID systems – instant backups in real time
Click here to return to list of backup devices.
Backup media
10AQA ICT AS Level © Nelson Thornes 200810AQA ICT AS Level © Nelson Thornes 2008
DAT tape
Removable media with large capacity – mostly for business use, using specialist drives in servers. The tapes can be removed and stored away from the server, giving a backup in another location.
Click here to return to list of backup devices.
Backup media
11AQA ICT AS Level © Nelson Thornes 200811AQA ICT AS Level © Nelson Thornes 2008
Remote backup services can be used for online backups.
Click here to return to list of backup devices.
Backup services
12AQA ICT AS Level © Nelson Thornes 200812AQA ICT AS Level © Nelson Thornes 2008
• Data must be backed up in case it is corrupted, lost or stolen.
• Media used for backup needs to be selected according to the data being backed up.
• Data can also be backed up remotely, using online services.
Summary