longernewer Switch

The longernewer switch lets you transfer only files that don't already exist on the destination system, files that are longer, or files that are newer (have a more recent date and time).

The longernewer switch can be used with these file transfer commands:
 

ztransmit and zreceive

Note You may not use the longernewer switch at the same time as the append, different, hash, newer, or nodelete switches.