System volume root's usage is 96%. This condition should not occur under normal conditions

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Irish_John wrote:

Not going to happen ...

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Odds are that the OS partition filled up due to the ClamAV issue (which seemed to hit the RN100 users).

If you do nothing, the OS partition can completely fill.  Configuration files can become corrupt, and the NAS often won't boot.  You'll need to use paid Netgear support at that point.

So you should pick one of the options below:

• attempt the ssh solution here: https://community.netgear.com/t5/Using-your-ReadyNAS-in-Business/System-volume-root-s-usage-is-90-RN102/m-p/1723405#M178497
• do a backup, factory reset, and restore the data from backup
• engage paid support now, to minimize the risk of data loss.

FWIW, if it's not ClamAV, it could be remnants of real-time transcoding files from Plex.  That wouldn't apply to the RN100, since it can't do real-time transcoding.  But it might the issue if you have an RN200 or better (and use Plex).  That also can be easily diagnosed and fixed with ssh.

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Irish_John wrote:

... I would lose all my data.

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Then you need to put a backup plan in place.