When creating a backup, this feature provides several benefits and trade-offs:
-ms=off : Disables solid mode for faster individual file access.
: To extract a single file from the middle of a large backup.7z solid archive, the software must decode all preceding data in that solid block, making partial restores slower.
-ms=2g : Limits solid blocks to 2GB to balance compression and access speed. 7z(1) — p7zip-full — Debian stretch