from another cache. Services MetaArchive’s services include data preparation, replication, geographical distribution, bit integrity checking, versioning, security, restricted viewing, and content restoration. When needed, the MetaArchive Cooperative will also perform format migrations for member content (to date, this service has not been required by the Cooperative’s membership). The Cooperative’s ingest procedure is compatible with any repository/content management system, including DSpace, CONTENTdm, ETDdb, and other systems. Membership Levels The Cooperative has three membership levels: Sustaining Members form the leadership of the Cooperative via their participation as Steering Committee members. Preservation Members engage in ongoing preservation activities. Collaborative Members are groups of institutions that run shared, centralized repositories and preserve this shared content in the MetaArchive preservation network. All members run a 16TB server and pay $1/GB/year for their preserved collections. The organizational model created and practiced by the MetaArchive Cooperative has served as a model for myriad other digital preservation groups, including the National Digital Stewardship Alliance (NDSA). References American digital libraries