Sort Folders and files and copy to external hard drive

Hi - I have least knowledge with scripting. I have a request from one of our user at work. They have a lot of folders and files on the network drive which is close to 2TB. They want to do a clean by copying all folders and files that were last modified as of 2009.

I looked at the folders and tried to sort by date but that will not work because they have a lot of sub folders and sub folders and files within each folders. It will be a tedious task to go through all folders and files looking for last modified as of 2009. Can this be done with a script that can scan the network drive where they have the folders and files and look for last modified date of 2009 and then copy those folders and files to external hard drive.

Here is an example of the folder structure on the network drive:

AR - Root Folder
Inside the Root Folder there are a number of sub folders
Inside the number of sub folders there are number of files with various last modified dates
I would like to copy only those folders, sub folders and files that were last modified as of 2009 to external hard drive.

Any help on the above would be appreciated.

I have googled and found few scripts in powershell but don't know what to modify to meet above requirement. I can share the PS script, if anybody want to have a look,

Thanks

Ram

P.s: I am willing to pay for your time in helping with this request.