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However, at higher compression levels, the time required to compress a file increases significantly.
Now, really, compressing a file is the same way, where the channel is just your hard drive.
So the idea of compressing a file statically and sending it through a channel, they're equivalent for our purposes.
It is therefore common to compress a file that is itself an archive, such as those created by the tar or cpio Unix programs.
When you right-click in Windows and say you want to compress a file, back in the DOS days there was - remember the company Stacker?