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...making backups frequently seems to be the only way to protect your data agains ransomware
The only true way to protect data is not to allow any unknown\untrusted executable file types to execute on your system in the first place - and these doesn't even take into consideration network security. Protecting the physical system is only 1/2 of the security equation; the other 1/2 is network security (and I don't just mean installing a firewall).
Backups are truly the very last line of defense -- meaning you rely upon them only when every other protection mechanism has failed.