Use rsync to trasnfer that big file, using the “–partial” argument you can resume the transfer if the connection goes down, so no problem there also remember to set the ssh “Client Interval” policy to avoid broken pipe errors. Example:
rsync –partial –progress –rsh=ssh root@182.47.48.23:/var/lib/vz/dump/big.file
That is it. And if for some reason the download crash or hangs, just cancel an re-execute.