LZ4 compression

I wanted to make a backup of several large software packages officially released in bzip2 or xz format. The extraction of official packages took a minute or more. Compression could take even longer.

I typed the compression command (tar + lz4) in the terminal. When I lifted my finger from the Enter key, the compression completed. 2 or 3 seconds at most. The resulting .tar.lz4 file is only ~10% larger than the original .tar.bz2 or .tar.xz package.

Given the fact that I need to backup TBs of experimental data in my lab, I feel LZ4 suitable for my application. (Zstd is not fast enough.)