RSync

Parameters

• --delete delete no longer necessary files from dest dirs
• -P shows progress bar and allows partial uploads (Resume later)
• -a syncs recursively and preserves symbolic links, special and device files, modification times, group, owner, and permissions. If you add this you do not need to add -r
• -n simulation mode
• -v verbose
• -z compresses the transfer
• -u copies only if dest is older

usually: --delete -avzP

A => B: rsync -avPu --delete