Although the QNAP App Store has two S3 Storage Apps in it, these two Apps only allow the NAS to connect to AWS or Google’s S3 Storage Services, and essentially back up to them.
What would be really great would be if QNAP had an App which actually provided S3 object storage out of the NAS, similar to how it can already provide SMB and iSCSI.
This would allow multiple servers on the network to connect to and use the NAS for their S3 Storage needs, rather than going externally to AWS, Google or some other provider.
Garage S3 (https://garagehq.deuxfleurs.fr/) is a pretty nice open-source local implementation of S3 Storage that can be run pretty much anywhere, and I think it could be run on a virtual machine on the NAS easily enough (I have not tried it, though), but the drawback of Garage S3 is that it does not support ACL or Policies, which makes it okay for single-source access, but less suitable for multiple simultaneous accesses from different sources.
If QNAP developed their own S3 App that fully supported Policies, ACL, etc., and released it in the App Store for its users, it would perk the ears of many Developers out there. It would enable users to set up several QNAP NAS at geographically separate locations and provide S3 Object Storage through them, giving them an enhanced level of performance, redundancy and reliability for their online storage – without putting their stored data in the hands of others.