Techniques for global single instance indexing for backup data are disclosed. In one particular exemplary embodiment, the techniques may be realized as a method for indexing backup data. The method may comprise generating a content hash for an item being backed up. The item may be associated with a resource name and the content hash may be used as an identifier in backup and indexing. The method may further comprise saving an entry for the item in an index database. The entry may comprise a resource list which may comprise the resource name and a reference count associated with the resource name. Moreover, the method may comprise setting a value for the reference count.