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Retrieves the current WAN ipv4 address via checkip.dyn.com.
The command copies a file from remote SSH host on port 8322 with bandwidth limit 100KB/sec;
--progress shows a progress bar
--partial turns partial download on; thus, you can resume the process if something goes wrong
--bwlimit limits bandwidth by specified KB/sec
--ipv4 selects IPv4 as preferred
I find it useful to create the following alias:
alias myscp='rsync --progress --partial --rsh="ssh -p 8322" --bwlimit=100 --ipv4'
in ~/.bash_aliases, ~/.bash_profile, ~/.bash_login or ~/.bashrc where appropriate.