Backwards compatibility and upgrade path complexity

Hello Omeka folks, I’m preparing a slide for ADE 2017 (Buffalo, NY) and I’m looking for some information on Omeka.

CMS Comparison Chart for Documentary Editions!AuCG4_XKsH2b7Un3Xji3_RkPnSv-

I’m specifically looking for the 2 cells in red:

  1. Backwards compatibility between major releases
    Does the new system maintain and recognize the prior system data?

  2. Upgrade path complexity
    Does a new system version require a lot of technical work?

This obviously applies to self-hosted instances, not

Thanks for any insights! And, happy to discuss the metrics and any other possible comparative factors which may be useful.

Digital Architect
Thomas A. Edison Papers
Rutgers, The State University of New Jersey