7-Zip is a free and open-source file archiver, a utility used to place groups of files within compressed containers known as “archives”. It is developed by Igor Pavlov and was first released in 1999. 7-Zip uses its own 7z archive format, but can read and write several other archive formats.
The following script look into all files (.bak) in a directory and create a zip file.
*.bak -> *.7z
set p1=%%~ni.7z set p2=%%i echo %p1% echo %p2% FOR %%i IN (*.bak) DO ..\..\7-Zip\7z.exe a -sdel -mx1 %p1% %p2%
33 GB -> 20 GB
1 GB -> 81 MB (5 min)