The vast expanse and volatility of art ephemera based on the World Wide Web pose significant threats to the completeness of the art historical record. Towards its mission to enhance the resources available for current and future research through collaboration, the New York Art Resources Consortium (NYARC) collects, preserves, and provides access to art ephemera born in digital formats native to the web. It leverages its member institutions’ collecting strengths and resources to establish a permanently sustainable web archiving programme. This article introduces NYARC's web archiving practices at the principal stages in a typical web archive's lifecycle, describes how each benefit from collaboration among its member libraries and external programme partners, and identifies opportunities for further art libraries and consortia to participate in this important effort to preserve at-risk art historical resources.