We have just copied a big chunk of files off a broken home NAS by mounting the hdd in a windows PC. Luckily this one has a windows format partition on it, the other one doesn't so I'll need to make a bootable Linux USB dongle, probably via https://www.pendrivelinux.com/ and boot from that.
Run powershell "as administrator" cd to the broken directory and use this command to recursively reset the permissions to the system default set for a whole tree.:
icacls .\ /reset /T /C /L
If that doesn't work you can take ownership of the tree using this command and then try the icacls (eye cackles?) command again
takeown.exe /F .\ /R
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