It seems that practices related to Cloud Computing are not so commonly investigated. Here’s a short list of papers about user research, sadly mostly focused on professional practices:
England, D., Randles, M., & Taleb-Bendiab, A. (2011). Designing interaction for the cloud. Proceeding CHI EA ’11 CHI ’11 Extended Abstracts on Human Factors in Computing Systems, pp. 2453-2456
Farnham, S.D., Turski, A., & Halai, S. (2012). Docs.com: Social file sharing in Facebook. In Proc. ICWSM 2012. Cambridge, MA: AAAI Press.
Marshall, C. & Tang, J.C. (2012). That syncing feeling: Early user experiences with the cloud, in Designing Interactive Systems (DIS) 2012, ACM, 11 June 2012.
Muller, M., Millen, D.R., & Feinberg, J. (2010). Patterns of usage in an enterprise file-sharing service: Publicizing, discovering, and telling the news. In Proceedings of CHI 2010. New York: ACM Press, pp. 763–766.
Rader, E. (2009). Yours, mine, and (not) ours: Social influences on group information repositories. In Proceedings of CHI 2009. New York: ACM Press, pp. 2095–2098.
Shami, N.S., Muller, M., & Millen, D. (2011). Browse and discover: Social file sharing in the enterprise. In Proc. CSCW 2011. New York: ACM Press, pp. 295–304.
Tang, J.C., Brubaker, J.C. & Marshall, C.C. (2013). What Do You See In The Cloud? Understanding the Cloud-Based User Experience through Practices, in Human-Computer Interaction – INTERACT 2013, Springer, 2 September 2013.
Voida, A., Olson, J.S., & Olson, G.M. (2013). Turbulence in the clouds: Challenges of cloud-based information work. In Proceedings of the ACM SIGCHI Conference on Human Factors in Computing Systems (CHI 2013). Paris, France, April 27–May 2. New York: ACM Press, pp. 2273-2282.