The Hub will assume that it is the base appliance that you used and will backup user editable locations and will create a reinstall list of installed packages. Assuming you used the standard repos included with TKL and haven't put anything in 'naughty places' then it will all go according to plan.

However if you have additional repos or manually installed .debs then I won't be able to install them. Also you may wish to do manual overide to include specific paths that are not included by default. See Liraz's post here for more detail.

Best way to go is to test it out and have a bit of a play.