Topic 6-Backup and Recovery

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Backup and Recovery

Why do we use back up?

makes a copy of the data so that in the event of a disaster data can be recovered

prevents permanent data loss

Backup and Recovery Plan

Which storage media should be used? e.g. Magnetic Tape, Cloud Computing, External Hard Drive

Where is the data i going to be stored? Usually off site in a fireproof case

When will the data be backed up? At what time of day and at what frequency

What type of backup? Full, incremental-changes since the last backup, differential-changes since the last full backup.

Who is responsible for the backup and recovery? e.g. Network manager

Disk Mirroring

(RAID 1)

Disk mirroring, also known as RAID 1, is the

replication of data to two or more disks. Disk mirroring is a good choice for

applications that require high performance and high availability such as

transactional applications, email, and operating systems.

Because both disks are operational, data can be

read from them simultaneously, which makes read operations quite fast. Write

operations, however, are slower because every write operation is done twice.

A “hot backup” or

Dynamic backup

A hot backup, also called a dynamic backup, is a

backup performed on data even though it is actively accessible to users and may

currently be in a state of being updated. Hot backups can provide a convenient

solution in multi-user systems, because they do not require downtime, as does a

conventional cold backup.

Hot backups involve certain risks. If the data is

altered while the backup is in progress, the resulting copy may not match the

final state of the data. If recovery of the data becomes necessary (for

example, following a system crash), the inconsistency must be resolved.

Software Backup

Options

Many of today's backup software programs offer a

wide array of backup options; giving you the flexibility to create a backup and

recovery solution that will fit your

needs. Here are a few:

One-Click System Backup Capability This creates a full

system backup with the click of a single button.

Files-In-Use Backup If the data you need to backup changes throughout the day, this tool is

a good choice, as it can perform several data backups while your computer is

active. The ability to backup files which are in use is an excellent tool for

those that work from home or those in an office with projects that evolve

throughout the day. This tool is available with most backup software programs.

Complete System Backup Also called Image Backup, Drive Image and Hard Drive Image, a complete

system backup saves a copy of your entire hard drive, including the operating

system, registry, drivers, software application as well as all of your data

files. This is the most comprehensive

type of backup and would allow you to restore your entire computer back to a

given point in time. A complete system backup is a good alternative to

reformatting a hard drive that's heavily infected with spyware or computer

viruses.

Advancing Your

Backup Capabilities

Some backup software comes with options that go

beyond the simple novice approach, giving you special tools to deal with unique

challenges. Here are a few examples:

Backup Data Compression Most backup software programs offer some form of data compression, which

allows you to pack more data into the same location - perfect for anyone with

limited storage space.

Backup File Filtering Filtering allows you to filter certain types of files for backup. For

example, you can select to backup all of the images in your hard drive - giving

you the freedom to refine your data backup in ways that best suit your needs.

This tool is also available on most backup software.

Backup Password Protection and

Encryption If you use

passwords to protect data on your computer, it makes sense to do the same with

your data backup. Most backup software offers password protection, but not all

allow you to encrypt your password, which keeps your files safe from hackers.