osmosis --read-apidb host="host" database="db" user="user" password="pass" --write-xml file="test.pbf"

osm2pgsql -H host -U user -P 5433  -W -d db -k -l -c -s file.pbf

mv file.pbf file.osm

osmosis --read-apidb host="host" database="db" user="user" password="pass" --write-pbf file="test.pbf"