Here is a good article worth to read:
https://cloudian.com/blog/object-storage-vs-file-storage/
cited from the ariticle:
To start, object storage overcomes many of the limitations that file storage faces. Think of file storage as a warehouse. When you first put a box of files in there, it seems like you have plenty of space. But as your data needs grow, you’ll fill up the warehouse to capacity before you know it. Object storage, on the other hand, is like the warehouse, except with no roof. You can keep adding data infinitely – the sky’s the limit.
If you’re primarily retrieving smaller or individual files, then file storage shines with performance, especially with relatively low amounts of data. Once you start scaling, though, you may start wondering, “How am I going to find the file I need?”
In this case, you can think of object storage as valet parking while file storage is more like self-parking (yes, another analogy, but bear with me!). When you pull your car into a small lot, you know exactly where your car is. However, imagine that lot was a thousand times larger – it’d be harder to find your car, right?
Because object storage has customizable metadata and all the objects live on a flat address space, it’s similar to handing your keys over to a valet. Your car will be stored somewhere, and when you need it, the valet will get the car for you. It might take a little longer to retrieve your car, but you don’t have to worry about wandering around looking for it.
