[Beagrie, 1998] Beagrie, N. (1998). Developing a policy framework for digital preservation. In Proc. of the Sixth DELOS Workshop on Preservation of Digital Information. [Chen et al., 1999] Chen, Y., Edler, J., Goldberg, A., Gottlieb, A., Sobti, S., and Yianilos, P. (1999). A prototype implementation of archival intermemory. In Proc. ACM Int’l Conf. on Digital Libraries. [Chervenak et al., 1998] Chervenak, A., Vellanki, V., and Kurmas, Z. (1998). Protecting file systems: A survey of backup techniques. In Proc. Joint NASA and IEEE Mass Storage Conference. [Cooper et al., 2000] Cooper, B., Crespo, A., and Garcia-Molina, H. (2000). Implementing a reliable digital object archive. In Proc. EuropeanConf. on DigitalLibraries (ECDL). In LNCS (Springer-Verlag) volume 1923. [Cooper and Garcia-Molina, 2001] Cooper, B. and Garcia-Molina, H. (2001). Creating trading networks of digital archives. In Proc. 1st Joint ACM/IEEE Conference on Digital Libraries (JCDL). [Cooper and Garcia-Molina, 2002a] Cooper, B. and Garcia-Molina, H. (2002a). Peer-to-peer data trading to preserve information. ACM Transactions on Information Systems, 20(2). [Cooper and Garcia-Molina, 2002b] Cooper, B. F. andGarcia-Molina, H. (2002b). Bidding for storage space in a peer-to-peer data preservation system (extended version). In Proc. of the International Conference on Distributed Computing Systems. [Crespo and Garcia-Molina, 1997] Crespo, A. andGarcia-Molina, H. (1997). Awareness services for digital libraries. In Lecture Notes in Computer Science, volume 1324. [Crespo and Garcia-Molina, 1998] Crespo, A. and Garcia-Molina, H. (1998). Archival storage for digital libraries. In Proc. ACM Int’l Conf. on Digital Libraries. Accessible at http://www-diglib.stanford.edu/- cgi-bin/WP/get/SIDL-WP-1998-0082. [Crespo and Garcia-Molina, 2000] Crespo, A. andGarcia-Molina, H. (2000).Modeling archival repositories for digital libraries. In Proceedings of the Fourth European Conference on Research and Advanced Technology for Digital Libaries (ECDL). [Crespo and Garcia-Molina, 2001] Crespo, A. and Garcia-Molina, H. (2001). Cost-driven design for archival repositories. In Proceedings of the First Joint Conference on Digital Libraries (JCDL). [Dingledine et al., 2000] Dingledine, R., Freedman, M., and Molnar, D. (2000). The FreeHaven Project: Distributed anonymous storage service. In Proc. of the Workshop on Design Issues in Anonymity and Unobservability. [Garrett and Waters, 1996] Garrett, J. and Waters, D. (1996). Preserving digital information: Report of the Task Force on Archiving of Digital Information. Accessible at http://www.rlg.org/ArchTF/. [Halpern and Lagoze, 1999] Halpern, J. and Lagoze, C. (1999). The Computing Research Repository: Promoting the rapid dissemination and archiving of computer science research. In Proc. ACM Int’l Conf. on Digital Libraries. [Kubiatowicz et al., 2000] Kubiatowicz, J., Bindel, D., Chen, Y., Czerwinski, S., Eaton, P., Geels, D., Gummadi, R., Rhea, S.,Weatherspoon, H.,Weimer, W.,Wells, C., and Zhao, B. (2000). OceanStore: An architecture for global-scale persistent storage. In Proc. ASPLOS. [Mullen and Wellman, 1995] Mullen, T. and Wellman, M. (1995). A simple computational market for network information services. In Proc. Int. Conference on Multi-Agent Systems. [Patterson et al., 1988] Patterson, D., Gibson, G., and Katz, R. H. (1988). A case for redundant arrays of inexpensive disks (RAID). SIGMOD Record, 17(3):109–116. [Rothenberg, 1995] Rothenberg, J. (1995). Ensuring the longevity of digital documents. Scientific American, 272(1):24–29. [Schloss and Stonebraker, 1990] Schloss, G. and Stonebraker, M. (1990). Highly redundant management of distributed data. In Proc. of Workshop on the Management of Replicated Data, pages 91–95. IEEE, IEEE Computing Society. [Stonebraker et al., 1994] Stonebraker,M., Devine, R., Kornacker, M., Litwin,W., Pfeffer, A., Sah, A., and Staelin, C. (1994). An economic paradigm for query processing and datamigration inMariposa. In Proc. Int. Conf. on Parallel and Distributed Information Sys.