I have faced this Robocopy error many times:
2010/03/20 11:48:37 ERROR 5 (0x00000005) Copying File C:\Foobar.pdf
Access is denied.
Waiting 30 seconds...The reasons for this error are many and the fixes depends on the reasons:
Check if the destination disk is full.
Try the /COPY:DT option. By default, Robocopy copies
using the option /COPY:DAT. This copies the
Data, Attributes and
Timestamps. /COPY:DT ignores the
Attributes.