Define users as command arguments, STDIN or mounted in /etc/sftp-users.conf (syntax: user:pass[:e][:uid[:gid[:dir1[,dir2]...]]]...). Set UID/GID manually for your ...
Local → Remote Files are streamed as chunked tar batches over SSH. Remote runs tar xf - to extract on the fly Remote → Local Remote runs tar cf -, local extracts with streaming extraction — files ...