I used a software named KGB Archiver to compress an 11.4 GB file to 82MB only.
About KGB archiver:
KGB Archiver , an open source compression tool like 7zip and UHARC with an unbelievably high compression rate .It uses AES-256 encryption (one of the strongest encryption known for man) to encrypt archives. The disappointing thing with KGB Archiver is due to its high compression rate its minimum hardware requirement is high ( recommend processor with 1,5GHz clock and 256MB of RAM ) and compression and decompression process is time consuming.
Very high compression power with very accurate results and no loss of data.
Due to high compression , the time required to compress and decompress the file is high. High system requirement
Click Here to Download KGB Archiver for free.
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