Where is big data stored?

Can you elaborate on the topic of where big data is typically stored? Is there a specific type of hardware or storage system that is commonly used? Additionally, are there any security measures in place to protect this vast amount of information from potential threats? Furthermore, are there any regulations or guidelines that govern the storage and handling of big data, ensuring its privacy and confidentiality? Lastly, how do organizations ensure that their big data storage solutions are scalable and able to accommodate future growth?