Migrate files using robocopy which are not three years old

Hi All,

We will soon migrate our Windows Server 2008 R2 File server to Windows Server 2012 R2, no DFS involved and we are migrating three file servers to a single file server, I believe there is no tool from Microsoft available like FSMT to migrate the data is this correct? we will use robocopy to migrate the data

My question is, we do not want to migrate three years old Files and folders to new file server, is this possible through robocopy, if yes then what is the switch to be used with robocopy.

Note: Three years old files are not being accessed by users but it is being accessed by backup software in order to take the backup.

Thanks

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