Anonymous
I worked for a bank 30+ years ago in IT. Banks, and all medium to large companies, are absolutely going to have backups. Even back in that time there were facilities available where they could jump on a plane with their backup tapes and have the bank computers up and running within 24 hours, or less. Of course, those facilities didn’t have the capacity to host more than 1 or 2 banks at a time.What good would be having a few banks running? Very little.
Of course these tapes could be stored in a vault for years, if necessary. Could anybody get to them and up and running after a year? Maybe. Depends on how serious TPTB wanted to keep the knowledgeable workers alive and the tapes secure. After 20 years? Not likely!