Switch -R - recurse subfolders
Enables subfolder recursion. May be used with the commands: a, u, f, m, x, e, t, k, rr, c and s.
When used with the commands a, u, f or m, files in all sub-folders will be processed as well as in the current working folder.
When used with the commands x, e, t, k, rr, c or s, archives in all sub-folders will be processed as well as in the current working folder.
WinRAR a -r Backup c:\*.*
See also:WinRAR t -r \*.rar