What do I need to do to protect myself from hack

Been seeing a lot of post about people getting their site hacked. I currently have the latest version of Drupal and all modules are current. Do I just need to keep checking and updating all my modules to prevent myself from getting hacked? I added SSL, anything else I should add? I downloaded everything onto my harddrive, if something were to happen, can I just clear my web host files and upload everything on the harddrive? Will that work or do I need to install everything over?

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