Seafile. It’s super fast and lightweight. There are some caveats though:
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Data is stored in git-like chunks on the server side. There is Seafuse and Sea drive functions that you can leverage to “assemble” the data on server side for backups. I personally use rclone mount, then backup.
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Paywall hiding some features. The community edition is free but is missing some features that pro has. Pro edition is free for 3 or less users.
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Documentation isn’t great. The forum is active so that’s helpful, but some of the docs take some time to understand
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Chinese owned. As far as I can tell, there is no call home for a self hosted server, so I don’t think it’s a worry in that case.
All that said, I like it much better than Syncthing for it’s selective sync. All files on each client are synced to the server. But unlike Syncthing, it doesn’t sync all data with each client. This is vital for me with some devices with small storage drives, so I would t want all files to sync. Yet I can still reach to the server from any client and pull data from any other client. Syncthing has an ignore flag, but that seemed way more trouble to setup than just sticking with Seafile.
I was poking around the Raspberry imager utility and they had RISC OS, which is and old operating system that was apparently fairly popular in the UK, but I’d never heard of it in the US. I loaded it up on my Pi 1 and had fun exploring it. Not exactly useful, but cool to mess with: RISC OS