Zip 'n' Split

From Magente:

Compress and split files reliably, quickly, powerfully, and conveniently. With Zip 'n' Split, you can compress a large file using a powerful compression algorithm. Split files based on file size or number of pieces. Verify split files for accuracy. Transfer split files using floppy and other drives, email or FTP. Join split files and decompress them to get the original file. Compress and split files into the desired number of pieces or sizes, and verify split files for accuracy. Transfer smaller split files using floppy drives and other storage devices, provide them for download via http or ftp, or e-mail them. Conveniently join and decompress split files to get the original file.