The info page for tar includes an example of using pipes to copy entire directories, using a pipe. The destination directory could be a share on another machine. This might be a better method of transfering such large amounts to another machine.
For example, here is how you might copy a directory's contents from
one disk to another, while preserving the dates, modes, owners and
link-structure of all the files therein. In this case, the transfer
medium is a "pipe", which is one a Unix redirection mechanism:
$ cd sourcedir; tar -cf - . | (cd targetdir; tar -xf -)
The command also works using short option forms:
$ cd sourcedir; tar --create --file=- . | (cd targetdir; tar --extract --file=-)
This is one of the easiest methods to transfer a `tar' archive.
Keep in mind, that when the files are transfered to another machine, that the group ownerships may need to be changed. The gid of the 'disk' group on one machine may not match the gid number of the 'disk' group on a second machine. You will need to compare the /etc/group files on the two machines.
The find command can locate any files by group ownership if there are group number/name differences.