7za a -r -t7z -m0=lzma2 -mx=9 -mfb=273 -md=28 -ms=8g -mmt=off -mmtf=off -mqs=on -bt -bb3 backups-.7z .\


& 'C:\Program Files\7-Zip\7z.exe' a -r -t7z -m0=lzma2 -mx=9 -mfb=273 -md=28 -ms=8g -mmt=off -mmtf=off -mqs=on -bt -bb3 SMP-vanilla-misc-versions.7z .\SMP-vanilla-misc-versions\



https://stackoverflow.com/a/52771612
https://stackoverflow.com/questions/27457326/compressing-a-folder-with-many-duplicated-files/52771612#52771612