Add option to disable backup compression

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What are the current gzip options used for the compression of the backups?

Unlike in the topic, I was interested in saving space by using a more efficient method of compression. I made some quick and dirty tests vs. our SQL dump with different gzip levels and also brotli.

2630702226 level1.sql.gz
2276305530 level1.sql.br
2216602536 level5.sql.gz
2147212204 level9.sql.gz
2036157791 level2.br
1851831279 level4.br

As we can see, Brotli level 4 destroys Gzip level 5 in terms of efficiency, while the compression time was in the same ball park. Brotli level 1 result was not bad considering it was lightning fast tool.

Anyway, I find gains of 10% or more quite interesting.

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