Function dump_to 

pub fn dump_to(
    client: &Client,
    org: &OrgId,
    instance: &str,
    engine: Engine,
    c: &Client,
    key: &str,
    compression: Compression,
    log: &mut RunLog,
) -> Result<(u64, u64)>

Stream a dump out of instance, compressed, into key. Returns the dump’s size and the object’s.