You have several issues.
Best to retain based on available storage not days.
NEVER move from NEW to STORED on the same drive. Simply keep it all in new.
200-250GB is not a lot a lot of space and is probably the issue.
You have an over-allocation error, so space is the problem.
Since you are putting it all on the C drive, you need to leave space for Windows, BI, any other programs, as well as about 10% of the capacity not allocated for to allow Windows to function.
But you really should look to add a drive just for the video.