FTP - no overwrite if file exists

I am pretty new to DOS so apologies if this is an obvious question. I have written a text file script to download files from an ftp site. I have it working fine - using mget and the file extension to dowload all files. I am planning to use IDL to run this script periodically, but I only want to download any new files that are on the site as the files are large and it will be a waste of bandwith to download files I already have again. I am wondering if there is a way of telling mget to skip a file if the file already exists in the folder on my computer, or if there's a better way of doing this.
Thanks!

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