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Just make sure that your cloud storage doesn't try to sync while you running a client, even if it is just one laptop.
Edit: I typically manually do the backup to my cloud storage when I am done working in FG.
FG autosaves every 5 minutes. Files in the campaign folder like chatlog.xml, db.xml, windowstate.xml just for starters.
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Same transfer speed of around 4 mbit running FG on a NAS virtual machine with the client connected via 1 Gbit Ethernet cable. So at least it's not slower with the VM server.