In August 2020, with funding from the Institute of Library and Museum Services (IMLS), Ithaka S+R launched an 18-month research project to examine and assess the sustainability of these third-party digital preservation systems. In addition to a broad examination of the landscape, we more closely studied eight systems: APTrust, Archivematica, Arkivum, Islandora, LIBNOVA, MetaArchive, Samvera and Preservica. Specifically, we assessed what works well and the challenges and risk factors these system...