The windows server does not know or care what the z/OS side looks like. The 4G issue would only be relevant if the disk that Windows stores the file on is formatted as FAT32. I have been backing up my z/OS data to a Windows box using FTP for years with no problems, and have many files 4G or larger. I use a product called bulletproof FTP, which costs less than $100 for a copy, and works great. Filezilla os OK as long as you don't have a need to transfer files to USS, which it does not handle well. You will need to convert the DF/DSS backups using AMATERSE in order to get them back properly. DF/DSS backups are RECFM=U, which can't be sent to a Windows box and back correctly. The only problem with AMATERSE is that it can be slow on a box with limited CPU.
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