1. Answer all parts of the questions and Consider the following backup Schema: .
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Question
1. Answer all parts of the questions and Consider the following backup Schema:
. Day 1. Copy to a back up medium all files from the disk.
.Day 2. Copy to another medium all files changed since day 1.
.Day 3. Copy to another medium all files changed since day 1.
This differs from the schedule given in Section 11.7.4 by having all subsequent backups copy all files modified since the first full backup. What are the benefits of this system over the one in Section 11.7.4? What are the draw backs? Are restore operations made easier or more difficult? Explain your answer.
System in Section 11.7.4:
.Day 1. Copy to a backup medium all files from the disk. This is called full backup
.Day2. Copy to another medium all files changed since day 1. This is an incremental backup
.Day3. Copy to another medium all files changed since day 2.
.
.
.Day N. Copy to another medium all files changed since day N-1. Then go back to Day 1.
Explanation / Answer
Given System in section 11.7.4
Day1: copy to a backup medium all files from the disk. this is called full backup.
day 2: copy to another medium all files changed since day 1. This is an incremental backup
day 3: copy to another medium all files changed since day 2.
.
.
day n: copy to another medium all files changed since day n-1 . then go back to day 1.
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This is a differential back up (which include the differences since the last full back up.)
The advantage of this system are :
Needs less storage space , since the changes to files are less.
The drawback is when we need to restore, it is more time consuming. we need to restore all levels upto full backup.
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Given backup schema:
This is incremental backup(it is a backup of all changes since the last backup)
Benefits of this system are:
If we need a full recovery , we can restore easily in less time .
Less number of storage devices or media are required.
Atmost two backup media are required to restore all the data. It simplifies restoration process.
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