Digital Preservation Services Overview

The TDL offers Digital Preservation Services to help Texas cultural heritage and scholarship stewards provide access to their treasures for the long term. TDL Digital Preservation Services include:

  • Distributed Digital Preservation Storage with auditing
  • Digital Preservation Consulting
  • Participation on Digital Preservation Services User Group

*Regular members who elect DP Services can schedule a full day of consultation with a digital preservation expert to prioritize content, plan workflows, and discuss related concerns.

Every digital preservation storage option begins with DuraCloud™.

TDL Members with both Digital Preservation and Repository services enabled, the following documentation describes the use of functionality that semi-automates the transfer of DSpace content to DuraCloud at TDL (and then into selected storage for preservation): Digital Preservation of DSpace Content

Preservation Storage Choices

  • Digital Preservation with Chronopolis
  • Digital Preservation with Amazon S3 Standard
  • Digital Preservation with Glacier Flexible Retrieval

Comparison of storage choices


ChronopolisAmazon S3 StandardAmazon Glacier Flexible Retrieval
Digital Preservation Storage options via DuraCloud@TDLNon-commercial, rooted in cultural heritage communityCommercial Commercial

Geographic Distribution

Three technologically diverse partner nodes: UCSD, TDL, UMIACSAmazon EastAmazon East
File Fixity and Data Integrity
DuraCloud@TDL MD5 hashes on upload.


Chronopolis checks SHA-256 hashes every 30 days or as specified by member, not to exceed 6 months.


ACE audit tool creates and checks ‘tokens’ for data integrity.

DuraCloud@TDL MD5 hashes on upload.


Amazon does some combination of MD5 hashes and cyclic redundancy checks (CRCs) with unspecified regularity, on upload, and when content is moved.

DuraCloud@TDL MD5 hashes on upload.


Amazon does some combination of MD5 hashes and cyclic redundancy checks (CRCs) with unspecified regularity, on upload, and when content is moved.

Additional Information