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Vio
Topic Author
Posts: 1484
Joined: Sat Feb 07, 2004 5:23 am

Help - What Is File Shadowing?

Wed Dec 13, 2006 3:23 am

Hi,

What I know:

File Shadowing is a term for the way which Windows archives its files. When you save a file it could easily double in size or be cut to half its size.This is not a progressive change. You can't continue to cut your files in half by repated saves. It wills stay between the high and low file size as it is archives, assuming nothing else is changed in the file.

What I don't know:

What logic does Windows use for this?
Why does it do it?
Does Winndows create a backup of the file, or duplicate information?


Thanks,

Vio
Superior decisions reduce the need for superior skills.
 
RichardPrice
Posts: 4474
Joined: Sat Apr 23, 2005 5:12 am

RE: Help - What Is File Shadowing?

Wed Dec 13, 2006 3:44 am

Quoting Vio (Thread starter):
What logic does Windows use for this?

Binary deltas using copy-on-write. Or split mirroring.

Quote:

Why does it do it?

Because you only need a start point and then files which contain the small changes between edits. By storing this information you can also reconstruct the file at any point in time from creation, so long as the deltas exist.

Quote:

Does Winndows create a backup of the file, or duplicate information?

Neither and both.
 
User avatar
Vio
Topic Author
Posts: 1484
Joined: Sat Feb 07, 2004 5:23 am

RE: Help - What Is File Shadowing?

Wed Dec 13, 2006 10:53 am

Thank you very much for your help  Smile

Regards,

Vio
Superior decisions reduce the need for superior skills.

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