On Thu, 2005-08-04 at 17:25 +0300, Michael Ben-Nes wrote:

> I want to backup a file constantly as it change.
> 
> Is it possible at all ?

Your problem is somewhat similiar to that of filesystems (ext3,
ReiserFS) and databases.

They solve it by journalling the changes which were made to the file
since the last backup.  So if you lose the original file, you can
recover it by retrieving the backup and re-applying to it the changes
listed in the journal file.
                                    --- Omer
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