There are two ways to get server data out of Terminal Services Manager: copy it to the clipboard, or save it as a CSV file.

The Copy submenu of the Servers context menu has three commands:
Hidden columns are not included. Sort order in the clipboard matches what you see on screen.
Choose Servers > Export servers to CSV from the main menu. A save-file dialog opens with a default name of the form servers-YYYY-MM-DD-HH-MM-SS.csv.
The export contains:
CSV is the only export format. The file opens directly in Excel and any text editor. On locales where the comma is the decimal separator, configure Excel's import to treat commas as field separators and dots as the decimal mark, or open the file through Data > From Text/CSV instead of double-clicking.
The exported data is a snapshot of the screen at the moment you press Export: the same columns, the same sort order, the same visible rows. Hidden columns are not in the file; checkbox state is not in the file. If you need a different shape (for example, just the slow servers), sort and filter the view first, then export.
The exported file is a one-time snapshot. For continuous monitoring, point a script at the same WMI counters and PDH paths directly.