No, surely not, no message history or archive or whatever.
But as the Jabber service is run in a dedicated virtual machine, it needs a kernel, a operating system, and thats Gentoo Linux (the hardware node/server for that runs Proxmox VE, currently upgrading from 3.x to 4.x). With the whole portage-tree (which we need for updates) the OS has about 5.5G.
As the transports are on another, seperated VM they also need about 5GB.
And the other services on the same server are again seperated.
Security first here
By the way, you can see the Gentoo ebuild which we use to build our ejabberd on https://git.linuxlovers.at/nik/gentoo-overlay - we're transparent too
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