This resource, from Culture24, states storing and managing your digital assets securely is as important as managing your collections. Naming and backing up files, security and location and creating master files and working copies are all important and you will need to decide what storage system to use.
Advice on collections management systems (CMS) and DAMS options for archives from the National Archives.
This resource from Collections Trust offers an overview of various CMS and DAMS options suitable for museums, with links to company websites.
The Digital Preservation Handbook provides authoritative and practical guidance in the management of digital resources over time and the issues in sustaining access to them.