pub(crate) async fn export_backup_stream<'a, W>( context: &'a Context, temp_db_path: &Path, blobdir: BlobDirContents<'a>, writer: W, file_size: u64, ) -> Result<()>where W: AsyncWrite + AsyncWriteExt + Unpin + Send + 'static,
Exports the database and blobs into a stream.