Run container with specified pgdata path:
docker run --name pgs-test -p 5432:5432 -v /Users/{user}/pgdata:/var/lib/postgresql/data -e POSTGRES_USER=usr -e POSTGRES_PASSWORD=pass1 -e POSTGRES_DB=db -d pgs-test

Backup:
docker exec pgs-test bash -c 'pg_dump -U usr --format=t --file=/pgback/back1.tar todo'

Restore:
docker exec pgs-test bash -c 'pg_restore -Uusr --create --clean --dbname=todo /pgback/back1.tar'