S3
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What is it?
AWS' file storage offering. S3 is actually rather well-known, as its structure and standards laid the foundation for a lot of other file storage services ("S3 compatible" is something you'll see a lot on competitor sites).
Why did we choose it?
Integration with other AWS services, but also for the indispensable Intelligent-Tiering storage class.
Unlike normal file storage, cloud storage has a whole bunch of options (on any provider) for storing data you need to retrieve immediately, or storing it more cheaply when you don't need to retrieve it that fast or won't be retrieving it often. Intelligent-Tiering is extremely useful; it's an automatic system you can use that moves stored files to cheaper tiers without having to do anything, which results in a lot of savings without any drawbacks.
What do we use it for?
Storing images, videos and other user content for BunnyCDN to serve to users. We also use it to store Deserted Chateau's frontend stylesheets and scripts, logo images and so on.