I understood op is talking about devices like an external hard drive, in which case any Linux only solution (based on fuse) won’t work for windows and similarly the easy nfs encryption option on folders wont work with Linux.

🤷

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Cross platform you’re sol, I’m afraid. If there’s an option I’d like to know, too.

Usually I cover my requirements with acl in this case.

I liked zimbra the time I used it but it is rather heavyweight complete collaboration suite.

Not only this, but also ‘agile’.

And it doesn’t weigh anything!