What do you think are the weaknesses of cloud storage? To me, the technology looks infallible but I am certain there would be weaknesses, no matter how little. It will take an IT person like you to understand these weaknesses.
So, there are several "weaknesses", but there are several advantages as well. With regard to the "weaknesses". I will give you two references. One addresses disadvantages and advantages from an IT business and service management perspective holistically. The other article is from a cybersecurity perspective.
Business and Service Management
https://www.jigsawacademy.com/blogs/cloud-computing/advantages-of-cloud-storage/
Cybersecurity:
https://blog.rsisecurity.com/top-5-disadvantages-of-cloud-storage/