Exosomatic memory is defined as below

Information stored in durable form external to the body (Idea drawn from Goonatilake, 1991), Bates, Four fundamental forms of information, 2006

You can also refer other articles, see below

It can be claimed as “the recording of emeories outside the brain.” see Wikipedia

By Birger Hjørland, you can find other two important definition about data, and exosomatic memory. These explanations are the part of the Core concepts in Library and information science(LIS) by Birger Hjørland
And this man, Newby is really a helpful for further research. See the paper titled as “Cognitive Space and Information Space” and “Empirical Study of a 3D visualization for information retrieval Tasks.”