if you want protection from a ransomware attack you absolutely want a cloud backup, or you need to setup a cloud-like backup solution, where the "local" server

if you want protection from a ransomware attack you absolutely want a cloud backup, or you need to setup a cloud-like backup solution, where the "local" server is somehow airgapped from your local network and uses a different set of credentials, and none of your local-net pc's have access to it, except to write new files.