Tar archive format does not support file deduplication scheme, therefore it has drawbacks for utilizing disk storage system efficiently. In this paper, we propose an extended TAR file format called DTAR (Deduplication Tape Archive) which provides file-level deduplication. Key idea of our work is to provide block aligned compressed file that can speed up file insertion and deletion for archiving. Furthermore, DTAR shows performance enhancement using file similarity scheme for distributing files into several storage nodes. Experiment results show that the proposed system can reduce data storage space efficiently and diminish network data traffic compared to general file transfer system.