how to synch several accounts on a single pc

the idea is to synchronize 5 google accounts on the same computer, using 
google backup and sync to have a copy of all photos (*) on the a.m. pc

I'd like to have a "family" folder, with 4 subfolders, one for each 
component (mum, dad, twins)
an additional "global" account would synch the root "family" (and all 
subfolders, of course)


(*) photos are those saved automatically from the mobile devices or added 
manually (from digital cameras)

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