Using robocopy you can easily script a copy of a source folder to a target folder and then log the results to a file. Then you can also tell it to copy all changes made at the source location to the target location every “n” amount of changes. Effectively mirroring the source to the target. The thing to keep in mind here is to always ensure your target is not a root drive letter if it’s on an existing volume because this will erase the files at the target location and then mirror the source. Instead it is better to create a target folder and mirror your files into there, that way there is no risk to you deleting files accidently.
After the robocopy is run you can look through the log and see which files have been copied and which ones weren’t and then tend to those files/folders individually on a case by case basis. This usually happens if a file is locked by another user or process or if the user you are running robocopy as does not have permission to the files or folders.
Robocopy is great because it does not crash during copy and it copies extremely fast as compared to the normal drag and drop method. You can script the copy and then just run it and walk away and come back the next day.