Roaming profile folder permissions

It depends on what your level of access is, are you a domain admin?  Make sure the root folder share is set to only Everyone(Full) and handle the subfolders with NTFS permissions.  But bottom line is your account or a group account should be in the root shared folder and inherited throught the subfolder structure with the appropriate permissions.  The next time you add an account with a profile it will give them permission to the folder and inherit your user/group permission.
   Not sure why you would need to delete any files on the client.  Sometimes we run into profile issues where we need to delete a corrupted profile on the server or workstation to have it re-sync one way or the other.  The only issue might be is if you need to reorganize or move any of the profile to another directory.  You may need to coordinate a reboot on the workstations, because they will not get the updated profile path location until a reboot.  Hope this helps.

Which folders are the root? student, 2012, folder_redirect, 2012?

How and what does sync do?

What is going to happen if and when the student signs into the profile from the student computer if:
there are student files on the computer and not the server profile?
there are student files on the computer and older files on the server profile?
there are student files on the computer and newer files on the server profile?

Never really answered.