This is a future feature that we are currently in the process of implementing. We will keep you posted. Please read this for a temporary solution. http://developer.nirvanix.com/forums/p/28/62.aspx#62 Regards, Barry R.

This has been discussed and we have plans to enhance uploads in the future. For now the suggestion would be to check yourself using ListFolder to verify the file doesn't already exist or to call delete before uploading. Regards, Barry R.