Backups Questions

What would be the best way to backup pins on a cluster? In the event of let’s say a trusted node getting hacked, a bad actor could remove and delete all pins which would propagate across the cluster.

That would be a problem.

Is backing up just .ipfs enough to restore the pins on the cluster? Or is also a list of CID required?

For the ipfs-cluster part (the cluster pins and their options/metadata), see Data, backups and recovery - Pinset orchestration for IPFS

For the ipfs part (the actual pins), usually backing up .ipfs does it, or even .ipfs/blocks.

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