Rsync through an intermediate server (2 hop)
rsync -a -e "ssh -A -J user@intermediate-host" local_path user@destination-host:/remote/path
+-----------------+ +-----------------------+ +----------------------+
| | | | | |
| | | intermediate-host | | |
| local host | | | | destination-host |
| /local_path +--------------------------------------------+ /remote/path |
| | | | | |
+-----------------+ +-----------------------+ +----------------------+