Time-based media
Time-based media is a term coined by museum conservators for durational works of art that unfold over a period of time. This work often relies on technology, but includes mediums such as performance art. In the late 1990s, various institutions and organizations started forming think-tanks and working groups to develop standard practices for the acquisition, analysis, and care for these works over time. Time-based media conservation 

Time-based media art presents unique challenges for the field of conservation. While early media conservators often came from traditional sculpture conservation backgrounds, contemporary media conservators benefit from having diverse backgrounds and experiences. The American Institute for Conservation formed the Electronic Media Group in 1998. The variable media initiative was active at the Guggenheim from 1999 to 2004. Matters in Media Art - a collaboration between the New Art Trust, MoMA, SFMoMA, and the Tate - launched in 2005 to help institutions, collectors, and conservators keep works of media art alive. NYU launched the Time-based Media Art Conservation Education Program in the fall of 2018 under the guidance of Christine Frohnert and Hannelore Roemich. In recent years, various time-based media working groups have formed at major institutions such as the Whitney, The Met, The Smithsonian, and The National Gallery of Art. Collectors 
Outside of institutions, major collectors of time-based media art include Robert Rosenkranz, Ingvild Goetz, Julia Stoschek, and Pamela and Richard Kramlich. Additional media 
Cass Fino-Radin, media conservator and founder of Small Data Industries, hosts the podcast Art and Obsolescence featuring interviews with artists, curators, conservators, and collectors of time-based media art. Artists 
The list below consists of notable artists who create or have created significant works that fall under the time-based media category:

 Ai Weiwei
 Alan Michelson
 American Artist
 Ana Mendieta
 Annea Lockwood
 Arthur Jafa
 Beryl Korot
 Bill Viola
 Bruce Nauman
 Carolee Schneemann
 Candice Breitz
 Christian Marclay
 Doug Aitken
 E. Jane
 Gary Hill 
 Hito Steyerl
 Ian Cheng 
 Joan Jonas
 John Akomfrah
 Janet Cardiff
 Jenny Holzer
 Laurie Anderson
 Lynn Hershman Leeson

 Matthew Barney
 Martine Syms
 Meriem Bennani 
 Nam June Paik
 Olafur Eliasson
 Pierre Huyghe
 Pipilotti Rist
 Rafael Lozano-Hemmer
 Richard Mosse
 Shigeko Kubota
 Shirin Neshat
 Shu Lea Cheang
 Sondra Perry
 Steven Vitiello
 Tacita Dean
 Tourmaline
 Team Lab
 Teiji Furuhashi
 Valie Export
 WangShui
 Yoko Ono

See also 
 Performance Art
 Experimental film
 Compression artifact
 New media art
 New media
 Virtual art
 Interactive art
 Sound art
 Internet art
 Digital art
 Tina Rivers Ryan

References 

Conservation and restoration of cultural heritage
Museology