I have the similar issue where the time it was set to
Copy every 1 day starting at 5:00 AM
I start the job at 8:00 AM and around 5:00 AM it says
"Copy interval has expired
Initial copy did not complete, and will resume on the next copy interval"
the file is approximately 1.4 TB but it does not seem to finish. I just moved the time interval to
Copy every 30 day starting at 5:00 AM and still does not complete.
no restore points currently my other smaller jobs copy fine. Set retention to 5.