Which files are necessary to back up for running timequest without compiling

would like to back up the result of FPGA(Altera) compilation, in order to be able to analyze the timing of a FPGA compilation, long time after compiling it. In addition I would like to reduce the size of this back-up. We have several compilation to back-up for each release or version given to a customer.

So my question is Who knows which files are used by Timequest ?

Thanks in advance for your help.