1. A computer-implemented method for selecting a portion of a content repository for replication, comprising: receiving, at a graphical user interface (GUI) operating on a computer, a selection of a content item in a content repository and an input describing one or more desired relationship patterns for replication, the relationship patterns associated with an ontology describing logical relationships between the selected content item and other content items in the content repository, the content repository including a plurality of content items, wherein the content items comprise digital documents, wherein the ontology is stored in one or more tags associated with one or more content items in the content repository; generating a query for the desired relationship patterns; identifying the selected content item and related content items of the content repository to replicate to a target storage device based on a storage capacity of the target storage device, wherein the target storage device is separate from the content repository, wherein the related content items comprise a logical relationship with the selected content item based on the desired relationship patterns; and selecting the identified content items of the content repository.