Prima regula este sa nu ai doar un singur back-up. Da, stiu, exista persoane care nu au nici macar un singur back-up.
Restul regulilor suna asa:
1. Local backup (External Disk/Time Machine/Time Capsule) is a backup purely against hard drive failure and nothing else. If this is your only backup strategy, it is not good enough!.
2. If data doesn’t exist in at least 3 places, it isn’t backed up. Use internet backup services. If I could recommend only one, it would be Dropbox.