upintheclouds mentioned 'missing WE settings' among other things. The BIM Server cannot help there, nor can it help sync the external hard drive.
Since the office PC will have to be left running anyway to support BIM Server, I would run a VPN server and/or an FTP server on it so that you can access any other office files (such as WE, xrefed DWG, hotlinked MOD, drawing-placed PDG, dwg, images etc) that you might discover you are missing.
Using some kind of sync software to sync to your external drive is a good idea, too.
All of this stuff is free and relatively easy on Mac. I'm a little out of touch with the tools you might use on Windows.
Karl
One of the forum moderators
AC 28 USA and earlier • macOS Sonoma 14.7.1, MacBook Pro M2 Max 12CPU/30GPU cores, 32GB