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Archive bits

Posted on 2006-11-22
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Last Modified: 2010-04-03
Hi

If a file is backed up, and marked as archived. Then at a later date that file is updated, what happens to the archive bit. Does it go away or is it still there.

If it is still there, will the file NOT get backed up as the archive bit is still there (assuming the type of backup that is to be used checks the archive bit first)
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Question by:LFC1980
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Expert Comment

by:Lee W, MVP
ID: 17999846
It's simple... the archive bit is turned on whenever the file is updated/saved or copied.  The only way to turn it off is by using a backup utility or copy utility that supports turning it off when you make a copy, and then only depending on the type of job.  If it's an incremental or full backup, the bit is turned off.  If it's a differential, it is NOT turned off.
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Author Comment

by:LFC1980
ID: 18000147
Still a bit unclear.

If i run a back up job and then a file is marked with an archive bit. The next day i make changes to the file, then when the backup jobs runs again, will that file be backed up again as it has changed, or will it not because it had the archive bit.
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Accepted Solution

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Lee W, MVP earned 100 total points
ID: 18000167
As I said, it depends on the backup job.  

A full backup job backs up EVERYTHING and resets the archive bit to OFF on EVERYTHING.

A differential backup job backs up ONLY files with the Archive bit set to ON - it does NOT change the archive bit.  Thus, these backups GROW until a full is done.

An incremental backup job backs up ONLY files with the Archive bit set to ON - then it turns the bit OFF.  These backups tend to be consistantly small, but can be time consuming and a pain to restore.

For more information on backup in general, you should review my backup comment - it started as a comment here and grew so big and comprehensive, I turned it into a web page.  Reference:
http://www.lwcomputing.com/tips/static/backup.asp
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Author Comment

by:LFC1980
ID: 18003399
Oh yeah....sorry about that, i'm just confusing myself


Thanks
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