db-to-files.js

client.select('*').from(opts.table).stream()
  .pipe(through.obj(chunkToFiles))
  .pipe(vfs.dest('./' + opts.table))

function chunkToFiles (chunk, enc, callback) {
  const primaryKey = chunk[opts.primaryKey]

  const keys = Object.keys(chunk)
  keys.forEach((key) => {
    const file = new File({
      path: `./${primaryKey}/${key}`,
      contents: new Buffer(chunk[key] + '')
    })
    this.push(file)
  })
  callback()
}