Data Backup Schemes
There are 3 backup schemes which each of them has its own advantages and disadvantages.
1. Full backup
This scheme type copies all file or folders to create a backup set.
Advantages:
- It has a unique repository in case of restoration.
Disadvantages:
- It requires more time and media capacity
2. Incremental backup
This backup copies the files or folder that changed or are new since the last incremental or full backup. If you have a full backup on day 1, your incremental backup on day 2 will copies only the changes made from day 1 to day 2. On day 3, it will copy the changes made from day 2 to day 3.
Advantages:
- It’s faster backup method and requires less media capacity
Disadvantages:
- It requires more time for restoration, all backup sets need to be restored since a full backup.
Given example: full plus incremental backup
+ Day 1: full backup
+ Day 2 to 7: incremental backup
-> Day 1: new files: 1, 2, 3 & 4
-> Day 2: file 1 changed
-> Day 3: file 2 changed
-> Day 4: file 3 changed
-> Day 5: file 2 and file 4 changed
3. Differential backup
Differential backup copies all files and folders that have been added or changed since a full backup was performed. All files or folders that were changed since a full backup are repeatedly copied to the backup set.
Advantages:
- It’s faster and requires less media capacity than a full backup set to make a full restoration
- It also requires less time to restore than incremental backup
Disadvantages:
- It’s slower and requires more media capacity than incremental backup because data that are backed up are cumulative.
Given example: full plus differential backup
+ Day 1: full backup
+ Day 2 to 7: differential backup
-> Day 2: file 1 changed
-> Day 3: file 2 changed
-> Day 4: file 1 changed
-> Day 5: file 3 changed
-> Day 6: file 4 changed
1. Full backup
This scheme type copies all file or folders to create a backup set.
Advantages:
- It has a unique repository in case of restoration.
Disadvantages:
- It requires more time and media capacity
2. Incremental backup
This backup copies the files or folder that changed or are new since the last incremental or full backup. If you have a full backup on day 1, your incremental backup on day 2 will copies only the changes made from day 1 to day 2. On day 3, it will copy the changes made from day 2 to day 3.
Advantages:
- It’s faster backup method and requires less media capacity
Disadvantages:
- It requires more time for restoration, all backup sets need to be restored since a full backup.
Given example: full plus incremental backup
+ Day 1: full backup
+ Day 2 to 7: incremental backup
-> Day 1: new files: 1, 2, 3 & 4
-> Day 2: file 1 changed
-> Day 3: file 2 changed
-> Day 4: file 3 changed
-> Day 5: file 2 and file 4 changed
Day 1
|
Day 2
|
Day 3
|
Day 4
|
Day 5
|
Day 6
|
Day 7
|
|
File 1
|
x
|
x
|
|||||
File 2
|
x
|
x
|
x
|
||||
File 3
|
x
|
x
|
|||||
File 4
|
x
|
x
|
x shows which
files were backed up.
3. Differential backup
Differential backup copies all files and folders that have been added or changed since a full backup was performed. All files or folders that were changed since a full backup are repeatedly copied to the backup set.
Advantages:
- It’s faster and requires less media capacity than a full backup set to make a full restoration
- It also requires less time to restore than incremental backup
Disadvantages:
- It’s slower and requires more media capacity than incremental backup because data that are backed up are cumulative.
Given example: full plus differential backup
+ Day 1: full backup
+ Day 2 to 7: differential backup
-> Day 2: file 1 changed
-> Day 3: file 2 changed
-> Day 4: file 1 changed
-> Day 5: file 3 changed
-> Day 6: file 4 changed
-
|
Day 1
|
Day 2
|
Day 3
|
Day 4
|
Day 5
|
Day 6
|
Day 7
|
File 1
|
x
|
x
|
x
|
x
|
x
|
x
|
|
File 2
|
x
|
x
|
x
|
x
|
x
|
||
File 3
|
x
|
x
|
x
|
||||
File 4
|
x
|
x
|
x shows which
files were backed up.
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