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The GitHub org page gives a better overview: https://github.com/opencloud-eu/

It's file sharing with organizational features (shared directories, autz) and some value adds. They have integrated collabora online[0] for web office tasks and provide search on some indexable files (full-text + metadata).

[0]: https://www.collaboraonline.com/

There's a list of features here (no mention of completeness/maturity though) https://opencloud.eu/en/features

Still more than a bit fluffy, but enough for me to bookmark it for future consideration, thanks. “File Native Backup” is interesting, while not a user feature - a lot of systems seem to give very little thought into that part of system admin.