Digital curation is the management and preservation of digital data over the long-term.
All activities involved in managing data from planning its creation, best practice in digitisation and documentation, and ensuring its availability and suitability for discovery and re-use in the future are part of digital curation. Digital curation can also include managing vast data sets for daily use, for example ensuring that they can be searched and continue to be readable. Digital curation is therefore applicable to a large range of professional situations from the beginning of the information life-cycle to the end; digitisers, metadata creators, funders, policy-makers, and repository managers to name a few examples.
Again, Kevin Bradley (2007) defined curation as "maintaining and adding value to a trusted body of digital information for current and future use"
Digital Curation takes a wholistic approach (Life-cycle Management) to digital materials to address the selection, maintenance, collection and archiving of digital assets for long term access, in addition to their preservation whereas Data management usually implies more of a computer maintenance and backup role.
http://www.dcc.ac.uk/resources/briefing-papers/introduction-curation/wha...