The Digital Preservation Coalition (DPC) is the UK organisation that advocates for digital preservation. It website is a treasure-trove of useful guidance, and their regular newsletter provides updates and insights on best practices for long-term preservation and use.
The DPC is also the leading provider of digital preservation training for museums, archives and libraries. Although not specifically aimed at museums, the training courses are regularly attended by museum professionals.
Clicking the link on this page will open this resource to view on the DPC website.