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Thanks. That means I need to move all data off the hosts on to, say, a NAS - then the NAS becomes the single point of failure. Can I operate a swarm without doing that but still duplicate everything from host 1 to host 2, so host 2 could take over relatively seamlessly (apart from local DNS and moving port forwarding to nginx on the remaining host)?

Yes, that’s it!

Very useful, reminds me of another browser based Linux manager I forget the name of. Not specifically what I’m trying to achieve but very handy to know, I’ll try it. Thanks.

RDP is fine but a brower stream is just as good if the performance works out, I’ll give it a look, thanks.