rsync –progress -vaz <from dir> <to dir>
-v Turn on verbose mode
-a This turns on archive mode. Basically this causes rsync to recurse the directory copying all the files and directories and preserving things like case, permissions, and ownership on the target. (Note: Ownership may not be preserved if you are not logged in as the root user.)
-z Turns on compression during the transfer. This option compresses the data as it is copied over the network.
Try –partial –append;
–append option tells rsync to make the (correct) assumption that
the destination file left by –partial matches the beginning of the
source file and just append to the existing file.