Answer: Please follow the security advisory to the letter. You will have to also re-initialize the NAS once you are comfortable with any backup of the data.
QNAP has added a Security Center with ransomware protection capabilities to the latest version of its QTS operating system for network-attached storage (NAS) ...
QNAP NAS users have been targeted by a flurry of ransomware attacks in the past two years, prompting the vendor to issue several such advisories, urgent patches ...
Will QNAP NAS ever be safe from ransome ware attacks? Or at least to a point where it's not expected, just for using the NAS to share files over the Internet.