While developing export processes, attention should be given to describing each resource in the package. If the relationships between the resources are also significant, ensure that this is expressed in the metadata as well. For example, if several data files are dependent on each other, or two items are versions of the same thing, or something should interact with the publication in a specific way, these relationships should be expressed so that they can remain connected in the preserved copy. Ask, what information is needed to restitch the seams between the resources in your package?
See also:
27. Assign persistent identifiers to publication resources, they can help perpetuate connections between resources