Hi Peter,
 Yes. I want to use Time Machine to restore everything under /opt/local because  installing Macport package causes the failure of other working software, such as NCL, ncview....
  It turns out that I made a mistake for "enter time machine".
  I click the "application--->time machine app" to activate the time machine. It's wrong.  I should choose "enter time machine" in the time machine icon at top of Macbook laptop.

 Now it is OK to restore the files.

 Tao


On 4/29/23 10:20 PM, Peter West wrote:
You’re not trying to restore Time Machine, are you? It doesn’t live in /opt/local. So I assume you are trying to use Time Machine to restore everything under /opt/local. Is that right?

If that’s the case, one of the steps is going wrong. For starters, I would select /opt in the Finder window that Time Machine displays before selecting the date in the timeline.
—
Peter West
p...@pbw.id.au
“Do not cling to me, for I have not yet ascended to the Father; but go to my brothers and say to them, ’I am ascending to my Father and your Father, to my God and your God.’”

On 30 Apr 2023, at 1:12 pm, Tao Zhang <tao.zh...@colorado.edu> wrote:

All,

  I want to follow the following procedure to restore /opt/local to previous date from time machine external drive,

but I get “Time Machine” can’t be modified or deleted because it’s required by macOS." error message after I click "restore" button.

 Do you know how to fix it?

Thanks,

Tao

https://apple.stackexchange.com/questions/407890/how-to-backup-and-restore-opt-with-time-machine-on-macos-high-sierra/459300#459300

Proceed as follows:

  * Open a Finder window.
  * Enter Time Machine.
  * Press ShiftCommandG and enter |/| to display the root folder of
    your drive.
  * Press ShiftCommand. to display hidden folders. You should see
    |/opt| now.
  * Browse the timeline on the right-hand side and select the desired
    date.
  * Select |/opt|.
  * Press Restore. Note that Time Machine will probably ask whether
    you want to keep a copy of your current files.



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