When to use copy backup instead of normal backup?

When to use copy backup instead of normal backup?
I know that normal backup has the archive bit marked, but copy backup not.
Could you give me a scenario which copy backup must use?
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Full Backup is when a file is backed up, its archive attribute is cleared by the backup software. If the file is subsequently modified, the archive attribute is set by the operating system, which indicates the file needs to be backed up. This way, backup software can filter out the files that don't need to be backed up. In a full backup, all selected files are backed up, irrespective of the archive attribute. Disk imaging does not set the archive attribute of any files. A full backup is also called a normal backup.
Copy Backup: A copy backup backs up all selected files but does not modify the archive attribute, unlike a full backup.

More to add:
Incremental Backup: Backs up all files that have changed on a file system since the last full backup or the last incremental backup.

The nuance between an incremental backup and a full backup is all files on a file system as opposed to selected files. As a general rule, everyday users need not consider the incremental backup. The process has its place in large offices and corporate environments where the time allowed to complete a backup is limited.

For large storage media, the incremental backup is the fastest backup method but restoring individual files or directories requires a lot of effort. Deciding to restore from an incremental backup usually means you must restore the entire archive. If files are backed up every night of the work week and the file was changed several times during the work week then there will be multiple backups of the file in the archive. Without spending a lot of time looking for the last backup of the files in question, to ensure that the latest version is restored, you restore the backups in the archive from every day of the week. Some backup software allows you to browse the archive so you can look through each and every backup set within the archive for the files you want to restore. Restoring from an incremental backup is either very time consuming or it is complicated.
Differential Backup: A differential backup backs up all files that have changed on a file system since the last full backup.

For speed, complexity and storage requirements, the differential backup sits between the full backup and the incremental backup.

The nuance between a differential backup and an incremental backup is that an incremental backup backs up changes since the last incremental backup, whereas a differential backup backs up the files that have changed since the last full backup. The difference is subtle; unlike restoring every backup in the archive for an incremental backup, if you performed a full backup on Monday and a differential backup on every other working day in the week, and the disk dies the following Sunday, to restore the data to where it was on the last working day, you restore the full backup then restore the last differential.

As with the incremental backup, everyday users need not consider the differential backup.
Good explanation.

Usage depends on what you are trying to do.

Copy backup might be used when you do NOT want to change the archive bit, and want to continue to have the files backed up  more than once, perhaps to different media.

I hope this helps !

wuitsungAuthor Commented:
Thank you very much for spending you time for me. But what I what to know is copy backup. I would like to know in what situation I have to, must use copy backup instead of full backup. Could you please give me a example? Like in a real case...
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Lee W, MVPTechnology and Business Process AdvisorCommented:
How about you need to create a testing server but don't want to mark the existing server/data as backed up because it's going to a testing system.

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wuitsungAuthor Commented:
ok. So you mean the purpose of copy backup it's not to disturb the current backup schedule?
Lee W, MVPTechnology and Business Process AdvisorCommented:
That could be one purpose.  It can be difficult to think of a really good time to use it... but every now and then, something comes up and having the ability to do it can prove handy when you least expect it.
wuitsungAuthor Commented:
Thank you for your help. By the way, I have another question here if you have time. Thank you. http://www.experts-exchange.com/Storage/Backup_Restore/Q_23154497.html
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