That is, compressing a 3 MB file to two diskettes remains a viable project, but takes too much time if you have to do it everyday or several times in a day. You have in this case to use other transfer tools, like Zip cartridges or even CD-ROMs. The throughput is much better, as you don't need the compression anymore. This is not a good solution when you exchange data across platforms. You have in this case to find the program that could uncompress the first archive.
Some programs know how to ignore the decompression engine and access the raw data.
See also the pages we publish on MacBinary files and SEA archives. Its files have a '.ZIP' extension. However, it appears that you can't just put the floppy disks in the drive and launch ZipIt on them. ZipIt insists on creating the target file in the same directory. As all the compressed files on the floppy disks have the same name, you can't just copy them in a subdirectory.