I don't use File.copy() myself it creates a 'NEW' file which makes it pretty useless to me. My Retrospect back-ups would be never ending. 
It looks like form your images you are making a copy across from mounted server? From a personal point of view I would have the system do the copy/moving of files… Here are a few functions that may be of use to you… Copying files/folders you could do this with the shells 'cp' or 'ditto'
Using cp…
#target photoshop
var source = Folder.selectDialog('Select a Folder to Copy from?');
var dest = Folder.selectDialog('Select a Folder to Copy to?');
if (source != null && dest != null) {
var res = cpFiles(source, dest);
alert(res);
}
function cpFiles(sf,df) {
var comm = 'cp ';
var optns = '-R ';
var sPath = "'" + sf.fsName + "/' ";
var dPath = "'" + df.fsName + "'";
var sh = comm + optns + sPath + dPath;
var res = undefined;
var sh = app.system(sh);
!sh ? res = true : res = false;
return res;
}
And much the same using ditto…
#target photoshop
var source = Folder.selectDialog('Select a Folder to Copy from?');
var dest = Folder.selectDialog('Select a Folder to Copy to?');
if (source != null && dest != null) {
var res = dittoFiles(source, dest);
alert(res);
}
function dittoFiles(sf,df) {
var comm = 'ditto ';
var optns = '';
var sPath = "'" + sf.fsName + "/' ";
var dPath = "'" + df.fsName + "'";
var sh = comm + optns + sPath + dPath;
var res = undefined;
var sh = app.system(sh);
!sh ? res = true : res = false;
return res;
}
And as you mentioned back-up… here are a few things you could use before/after your process to store/back-up whichever…
ZIP a folder…
#target photoshop
var source = Folder.selectDialog('Select a Folder to create ZIP From?');
if (source != null) {
var res = makeZIP(source);
alert(res);
}
function makeZIP(sf) {
var comm = '/usr/bin/ditto ';
// These should be default after 10.4 Tiger?
var optns = '-c -k -rsrc --keepParent ';
var sPath = "'" + sf.fsName + "' ";
var dPath = "'" + sf.fsName + '.zip' + "'";
var sh = comm + optns + sPath + dPath;
var res = undefined;
var sh = app.system(sh);
!sh ? res = true : res = false;
return res;
}
Disk Image a folder…
#target photoshop
var source = Folder.selectDialog('Select a Folder to create Disk Image From?');
if (source != null) {
var res = makeDiskImage(source);
alert(res);
}
function makeDiskImage(sf) {
var comm = 'hdiutil create ';
var optns = '-srcfolder ';
var sPath = "'" + sf.fsName + "' ";
var dPath = "'" + sf.fsName + '.dmg' + "'";
var sh = comm + optns + sPath + dPath;
var res = undefined;
var sh = app.system(sh);
!sh ? res = true : res = false;
return res;
}
And lastly TAR Archive a folder…
#target photoshop
var source = Folder.selectDialog('Select a Folder to create TAR Archive From?');
if (source != null) {
var res = makeTAR(source);
alert(res);
}
function makeTAR(sf) {
var comm = '/usr/bin/tar ';
var optns = 'cjvf ';
var dPath = "'" + sf.fsName + '.tbz' + "' ";
var sPath = "'" + sf.fsName + "'";
var sh = comm + optns + dPath + sPath;
var res = undefined;
var sh = app.system(sh);
!sh ? res = true : res = false;
return res;
}
They are for 'mac' and all expect a folder object or two…
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