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“dump” a directory structure and compress the data while streaming it via ssh to a remote server.

cd /parent/path/
dump -af- data_directory | gzip -1 - | ssh user@hostname dd of=image.gz

“restore” a directory structure while using gunzip to decompress the data stream via ssh from a remote server.

cd /parent/path/
ssh user@hostname dd if=image.gz | gunzip -1 - | restore data_directory