Collaborative Long-Term Data Preservation: From Hundreds of PB to Tens of EB

In 2012, the Study Group on Data Preservation in High Energy Physics (HEP) for Long—Term Analysis, more frequently know as DPHEP, published a Blueprint report detailing the motivation for, problems with and situation of data preservation across all of the main HEP laboratories worldwide. In September of that year, an open workshop was held in Krakow to prepare an update to the European Strategy for Particle Physics (ESPP) that was formally adopted by a special session of CERN’s Council in May 2013 in Brussels and key elements from the Blueprint were input to that discussion. A new update round to the ESPP has recently been launched and it is timely to consider the progress made since 2012/2013, list the outstanding problems and possible future directions for this work.