GDataCopier does not do this at the moment. This is lodged as a
feature request and we intend to work on this on the forth coming
versions.
Basically the issue is that Google Docs does not identify the Document
with the Document title, and hence you can have two documents with the
same title. To facilitate an update we have to maintain a local list
of document identifiers so we know the document id for each uploaded
file.
Making a generic solution is a little difficult, since we have to
consider multiple platforms.
However if you are willing to write a little bit of Python and build a
custom solution for yourself, it should be a relatively simple script
to write.
Feel free to post any questions you have, we are more than willing to
share ideas :)
Thanks for trying out / using GDataCopier.
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