Script data recovery

Hello everyone,

I was given the following directive: to write a script to automatically back up data on portable X posts.

In theory, I issued the first: each time a user, run a login script (via Active Directory) making a copy of all files in a given directory to a backup server.

Code:

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net use z: \ \ server \ backup \% username%
xcopy c: \ data z: / e / h / y / k

---

will do.

If at each logon users ages 3 expect that all data is copied, it does not. He therefore suggested that a condition for retrieving data: only copied the files new or modified since the last time.
Here it goes again:

Code:

---

net use z: \ \ server \ backup \% username%
xcopy c: \ data z: / e / h / y / k / a

---

But if you think about it, I thought: if the user has at 1st January 1GB of data recovered, and then 3 months after he deleted the data locally and replaced it with 1GB of something else, the server will retain 2GB , which is not useful and could quickly overburden.
Therefore, how to have the files on the disk server are deleted if they are no longer on the client?
I do not know if there is such a command. Perhaps a "if". If yes, what would it?


Thank you in advance for your answers.

- According to the facilities --

* Safeguarding days on a medium pair
* Odd days backup on another media
* Backup and accumulation weekend archive on another media.
As against the storage time should be set! or increased depending on how the life of the media.

I discovered the Robocopy command, introduced in Windows Server 2003 Resource Kit Tools

My formula would be:

Code:

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Robocopy e: \ monrepertoire d: \ monbackup / mir / s / purge / r: 0

---

This is the parameter "/ purge" which makes all the difference with my simple xcopy, it removes what is on the server is no longer on the client.

But since yesterday, I thought back to the thing. I thought it would be good if the data are deleted from the server if they are no longer on the client after a certain period. Because if a client destroys its data locally, and then opens a new session, the server will respond deletion!