Designed and implemented a hybrid file system combining SSD and Cloud Storage System, like Amazon S3. Main idea of this file system comes from this paper: M. Vrable, S. Savage, and G. Voelker. BlueSky: A Cloud-Backed File System for the Enterprise. 10th USENIX conference on File and Storage Technologies, USENIX Association, Berkeley, CA, USA (2012), pp. 19-19.