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S3 Server
Zenko CloudServer, an open-source Node.js implementation of the Amazon S3 protocol on the front-end and backend storage capabilities to multiple clouds, including Azure and Google.
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SurveyJS
Open-Source JSON Form Builder to Create Dynamic Forms Right in Your App. With SurveyJS form UI libraries, you can build and style forms in a fully-integrated drag & drop form builder, render them in your JS app, and store form submission data in any backend, inc. PHP, ASP.NET Core, and Node.js.
I would need a place to store backups, probably made with duplicati and in another folder for temporal files, just throw them in there and check what it is later, with File Browser
Another upvote for building an S3-based backup server. For the project, you can deploy free solutions like Minio, Scality Server to provide S3 compatible object storage for your clients which is ransomware resilient. https://min.io/ https://github.com/scality/cloudserver