"Nextcloud needs a minimum of 128MB RAM, and we recommend a minimum of 512MB."
I realize it does say that's it's highly variable but that seems like a really low minimum to me...how many users could that handle...better yet a server serving around 50user(total not always at same time) for files/calendar/maybe onlyoffice would 4gb be enough?
I have set at 16GB to server a couple of hundreds of requests/s
BUt yes,4GB would be good for your usecase :)
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