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Synology and FreeNAS support backing up to Backblaze B2, both easily configurable in their respective GUIs. Many other popular NAS solutions allow you to install Duplicati, which will allow you to do the same.

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Will the nas connecting count for the 30 days?

I've been thinking about having an external backup of about 5 TB of images, video and documents in an encrypted form but I have issues finding someone who can do it properly.

For now I just have a 2nd nas at my fathers house that mirrors my data.

I've always backed up my NAS to B2 since its early days, and honestly have forgotten about the 30 day deletion limit. I've never encountered the limit in various NAS setups, even when I backed up using cronjobs using the B2 Python client library.

Is this a sync or a proper versioned backup (à la Hyper Backup)?

So will it protect me against ransomware and accidental mass file deletion?

Not out of the box, no. The FreeNAS implementation (and I assume many others) depends on rclone [1], which describes it as rsync for cloud providers.

For protection against that you would have to implement periodic snapshots (which many NAS products also support) and sync the snapshots. Or you could probably use B2's built in snapshot feature. Both require additional manual work, though.

[1]: https://rclone.org/

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