Use this switch to store and restore NT (NTFS) security information for files and directories. Note that only NTFS file system supports that feature.
Current version of 7-Zip can store NT security information only to WIM archives.
7z a a.wim -sni *.txt
stores txt files with NT security information.
7z x a.wim -sni
unpacks a.wim and restores NT security information.
a (Add), e (Extract), u (Update), x (Extract with full paths)