Solved Why I can't write sectors on this external USB disk ?

I use an asynchronous mirror process instead of a RAID1 arrangement now.
My concern is far more about data loss than hardware failure.

I have a Data disk that is user-visible and accessible.
Next is a Data_Mirror that is not user-visible, and admin rights only.
This hides the Mirror disk from malware.

I use a process to do a one-way sync between these two volumes.
If a directory on Data is deleted and irretrievably lost, it still exists on the Mirror disk.

This does create duplicates when directories are moved or renamed.
I wrote a duplicate file manager to handle this, as required.
 
My backup strategy.
Each 10 minutes i take a snapshot with sanoid, because for zfs this is cheap.
Then each 8 hours i do a full backup with syncoid to another drive.
 
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