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Time Machine not working...it says the external drive is read only?

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Last Modified: 2020-01-11
I have been using a 4 TB external hard drive to do time machine backups.  time machine stopped working
about 6 months ago and it says that time machine is not working...the drive is read only.  I have previous time
machine backups on that drive.  What has caused this and what should I be doing about it?
Thanks,
capreol
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