Window and Unix write compatible datasets. SAS can read a Window created dataset on a Unix machine and the reverse. But there is a performance hit. So you probably want to re-create the dataset on Unix once it is there.
Compressing the file will help with the transfer (although I think some transfer protocols can do that on the fly). GZIP can be used for a single file. ZIP can let you put multiple files into one "archive". You will need to reverse the process on the target machine once the file is copied there. SAS datasets (and also SAS CPORT files) will normally compress a LOT. I used to see the size reduced by 80-95 % back in the day.
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