I have finally created a backup of the site data, htdocs. The 4TB scratch disk should be formatted once again, as the entire www-data directory set is no longer needed. I have already removed it from the NAS as it was supposed to be temporary.

The recent database and htdocs mirror are being sent to the NAS, and all very old server data will be burned on two Blu-ray 25GB discs. That same data will remain on the older 1TB drive, but removed from the NAS.

I have yet to mirror the site configuration; that was planned about two months prior to the upgrade.