|That question is very difficult actually. When you say to only copy files that have changed, since a given date, THAT on itself is easy ... but of course, he would ADD these file to the reference backup structure he already has ... making it a full - updated - backup structure. |
What I think you want, is to have a resulting structure of files, but ONLY the ones that have changed after a given date. Correct ?
The issue is the reference, if you update to an existing structure, he uses the files of the already existing files on the target structure, as reference. But since you do not want those files ... you don't have a reference.
What you can do, is run XCOPY with /D, and supply it with a date. Example :
/D:m-d-y Copies files changed on or after the specified date. If no date is given, copies only those files whose source time is newer than the destination time.
He would then only copy the files from source structure, which are newer than that date, and you can copy to a non-existant target structure. Maybe this is what you are looking for. Of course, YOU need to provide that date !
And note, and this is very tricky, there IS a difference between a file with a change-date later than 2010, and a file which has been "changed" after 2010. Example, on the 5th of January, I can copy a file with a timestamp of 1997, onto a file that was previously created on the 3rd of january of 2010.
The file has got a very old date, but still, it has changed. The date of actual change, is not always the date of the timestamp of the file itself.