Your USB stick has become stuck mounted read-only which is preventing the EFIS from writing the daily system backup to the stick. Pull the stick out...
The Seattle Avionics CharData Manager will load the FAA airport diagrams, and if selected, will load the SA airport diagrams on the memory stick too....
I'd really like that feature too. I do have the IFD set up for that functionality on a user defined field, but then I have to put the VFPL into both...