2011 MacBook Air - Time Machine Failing

[Kenny99]

MacBook Air 13" Mid 2011 1.7Gb i5 256Gb HD (Free Space 52Gb)
High Sierra 10.13.6 (Fresh Install)

TimeMachine failing with NO message after apex. 50Gb (Backing up: XX Gb of 187 Gb) and Nothing backs up (written) to the 1T TM ext. HD

I have Tried:
First Aid on the HD and on the Ext. HD (No Errors)
Reset the NVRAM and SMC
Recover Mode and First Aid on HD (No Errors)
Different TM HD (1T) Formatted and 0 bites on Drive. (formatted on MacBook Air)
HD was tested (TM backup done) on my 2020 Mini and worked.
Mac is plugged in to power supply. Battery is at full charge.
All Applications run with No errors.

Help Please.

 

[Kenny99]

Update: While monitoring the backups with the Console I am seeing a LOT of errors in iTunes and Videos. I have added these directories to the Time Machine ignore but their are just too many.
So option #2 is to copy the Files that are important to an ext HD and then reformat the Mac HD , clean install of High Sierra. As this is a OLD Mac its more for Web and play than anything else.
Thanks everyone.

 

[xboxbml]

Update: While monitoring the backups with the Console I am seeing a LOT of errors in iTunes and Videos. I have added these directories to the Time Machine ignore but their are just too many.
So option #2 is to copy the Files that are important to an ext HD and then reformat the Mac HD , clean install of High Sierra. As this is a OLD Mac its more for Web and play than anything else.
Thanks everyone.

Let us know how it goes.. I'm curious. I've never had an issue with TM before..