or you can use an FTP like terrapin
http://www.tpin.com/eu/tpinftp/tpinftpsetoverintro.html which you can download and use free for a trial period - then pay 20 quid for a license if you like it.
This will allow your son to download the whole of his web and upload it to the new location.
If you do this, I suggest NOT allowing Trrapin to make "corrections" during upload if the site already works well.
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What goes around . . .
. . often lands better!