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Help - What Is File Shadowing?  
User currently offlineVio From Canada, joined Feb 2004, 1446 posts, RR: 10
Posted (8 years 2 weeks 2 days 4 hours ago) and read 2851 times:

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.
2 replies: All unread, jump to last
 
User currently offlineRichardPrice From , joined Dec 1969, posts, RR:
Reply 1, posted (8 years 2 weeks 2 days 4 hours ago) and read 2839 times:

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 currently offlineVio From Canada, joined Feb 2004, 1446 posts, RR: 10
Reply 2, posted (8 years 2 weeks 1 day 21 hours ago) and read 2809 times:

Thank you very much for your help  Smile

Regards,

Vio



Superior decisions reduce the need for superior skills.
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