And if it's "automatic", almost by definition it's always online & thus vulnerable to a potentially WORSE (insofar as data recovery is concerned) mode of failure... encryption by ransomware.
Seriously. Name one... ONE... NAS or online backup solution that allows continuous adhoc writing, but acts like a virtual WORM filesystem and merely marks obsolete files as 'deleted' without actually deleting them, so that any attempt by ransomware to encrypt the files on the backup drive would simply fill up the drive until the ransomware crashed (and quite possibly provide an early warning of what it was up to).
In some ways, it feels like we've gone backwards over the past 20 years. Capacities have increased exponentially, but new hard drives seem to drop like flies compared to drives from 10-20 years ago. And often, they fail in creative ways that RAID (1, 5, 10, or whatever) can't save you from (golden example: OCZ's second-generation SSDs with Sandforce controllers that simultaneously omitted the supercapacitor needed to make sure the drive never lost power during writes (to save about a dollar per drive) AND disabled the multi-step safety measures Sandforce built into the default firmware (because it made the drives slow).