backup

as a backup system: 

swarms of communication micro satellites that can be launched into orbit if vast amounts of satellites and other communications equipment are destroyed 

if micro satellites are laser communication only, that could be more secure and discreet, 

more difficult to intercept/interfere laser communications, 

more easy to notice radio communications, more difficult to notice laser communications 

and if possible a cache of laser communications micro satellites in space, 

that could be moved into earth orbit if satellite communications are destroyed