I am currently pondering this exact problem. I want to run a file-sharing web application (think: NextCloud) but I don't want to use expensive block storage or the dedicated server's disk space for the files, as some of them will be accessed infrequently.

I am wondering if s3fs/rclone-mount is sufficient, or if I should use something like JuiceFS that adds random-access, renaming, etc on top of it. Are those really necessary APIs for my use case? Is there only one way to find out?

(The app doesn't have native S3 support)