You can overwite existing files by calling GetStorageNodeExtended and passing true to the fileOverwite parameter. You can find more detail about this call here: http://developer.nirvanix.com/sitefiles/1000/API.html#_TocGetStorageNodeExtended Regards, Barry R.

This is a planned feature (Possibly more on this front as well) but for now the best way to solve it is to rename your existing file and then upload or delete then upload or give your upload a unique name then rename after it has been uploaded. Since uploads can fail (Due to account limits, or other...