In the left pane, click on 'My Computer' to expand the listing. Now, highlight Local Disk (usually C:\). Now, at the top menu, File-->New-->Folder and name it something meaningful like 'TT backup when new' or you can provide a date in the folder name. You get the idea. It is this folder to which the contents of your unit will get backed up to.
For subsequent backups, use a different folder (perhaps a sub-folder of the previous one) again giving it a meaningful name. You'd want a new backup for every application update and especially every map update).
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