This book is grounded in the findings of my doctoral research, which investigates the practices of managing and preserving digital cultural material in a time of intense technosocial and technocultural transformation. The present research gesture seeks to trace these practices and to consider the spatial effects they generate in the construction of an informal mnemonic of the “immaterial.” In doing so, it turns to a spectrum of practices within the domain of informal preservation-not with the intention of diminishing or eliminating hegemonic, institutional strategies, nor to suggest a displacement of preservation from formal institutions toward informal, unofficial practices. Rather, its purpose is to illuminate the transformation of the very terms of preservation itself: from management understood as an institutional privilege toward management understood as the activity of an ecosystem-an assemblage composed of a heterogeneous mixture of practices and agents, both human and non-human.