To me, the biggest problem with "Cloud Data Analytics" is keeping the data safe in the cloud. Here is one paper overview of data security issues: Article Exploring Data Security Issues and Solutions in Cloud Computing
Since this industry moves really fast, I would advise checking good industry reports that come out. This one on data breaches from Verizon is a pretty good one:
Article Secure and efficient online data storage and sharing over cl...
Article Cloud Dynamic Scheduling for Multimedia Data Encryption Usin...
This article is may be useful for your question...
Jayapandian, N., Zubair Rahman, A.M.J.M. Secure and efficient online data storage and sharing over cloud environment using probabilistic with homomorphic encryption. Cluster Comput 20, 1561–1573 (2017). https://doi.org/10.1007/s10586-017-0809-4
Jayapandian, N. Cloud Dynamic Scheduling for Multimedia Data Encryption Using Tabu Search Algorithm. Wireless Pers Commun (2021). https://doi.org/10.1007/s11277-021-08562-5