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-ms=2g : Limits solid blocks to 2GB to balance compression and access speed. 7z(1) — p7zip-full — Debian stretch
The "solid" feature in a file refers to Solid Compression , a method where 7-Zip treats multiple files as a single continuous data block. backup.7z
: Because similar data patterns across different files are compressed together, solid archives significantly reduce file size, especially for backups containing many small or similar files. -ms=2g : Limits solid blocks to 2GB to