Some time goes in the naming-conventions of the files and the extra-files (posters, .nfo, ...)
If you want to safe these and not the (big) movie-files, a small script like
robocopy z:\ c:\mirror\ /S /E /create /XD excluded excluded2
robocopy z:\ c:\mirror\ /S /E /XF *.mpg *.eyetv /XD excluded excluded2
First, all files and directories are created with 0 bytes, then all files except the big files are copied.
z:\
would be the drive you mapped an unraid-share to,
excluded excluded2
is list of directories in this share you want to ignore,
c:\mirror\
of cause the local destination and
*.mpg *.eyetv
the list of extensions of the big files.
All in a .zip makes a very compact file for a backup of some work.