Digital preservation: good practices and trusted repositories

Library of Congress guidance on personal digital archiving

NESTOR (Network of Expertise in the Long Term Storage of Digital Resouces) 

Catalogue of Criteria for Trusted Digital Repositories (Version 1 - 2007)

Nestor-Handbuch: Eine kleine Enzyklopädie der digitalen Langzeitarchivierung (Version 2.3 - 2010)

Trustworthy Repositories Audit and Certification: Criteria and Checklist (TRAC) which was developed by OCLC's Research Libraries Group and the US National Archives and Records Administration and published in 2007.  

ISO 16363:2012 Space Data and Information Transfer Systems Audit and certification of trustworthy digital repositories

DIN 31644 Information and Documentation Criteria for Trustworthy Digital Archives (German)

Data Seal of Approval (DSA).