The important decision making process for going for external Content Repository vs SAP DMS
1.Volume of documents being archived.Where to store ?
2.Do you receive documents from external sources.
3.Retention policies on the documents.
4.Integration of your incoming or outgoing documents with B2B or B2C portals.
5.Conversion of paper documents and storage eg.AP invoices.
6.Collaboration of documents within ERP system and non ERP system within organization-enterprise level.
7.Compliance requirement like 21 CFR chapter 11 and/or SOX