COPY/XCOPY from network: restartable mode

I recently had to copy a very large file (>4GB) from a remote Windows share to my Windows 7 machine, over a very finicky connection (frequently-failing VPN over a slow Internet connection). A GUI copy didn't work because the connection dropped frequently. Then a colleague pointed me to the "copy /z" command:

/Z Copies networked files in restartable mode.

And this simple, built-in tool turned out to be the thing I needed. It was, every time, able to restart the download properly, and after a few times, it downloaded the file correctly.
A couple of tips:

• If you interrupt the command with Ctrl-C, it will delete the portion copied so far and you'll have to restart the copy from the beginning. If you must interrupt a copy, simply terminate the network connection (it will die with an error, but leave the copied-so-far file) or close the window where the command is running.
• When you restart it and it asks if you want to overwrite, you must answer "yes". You can also use the /Y flag.

Trovato qui.