Emergency Backup of SeasonPass on Failing Computer

My OSX computer ios dying quick.  I am backing up all my documents.  However, i have a tethered ATV2.  I am worried that if my machine dies and I get another one, that I will not be able to tether it next time it needs a restart or crashes.  Can anyone tell me what files and where they are that need to be backed up so that I can install seasonpass on my new computer (when I get it) so that i can run season pass and tether boot the same atv2.

 

Please help.  I am not sure how long i can keep it running before it dies.  There are many clicking noises on the mac and it keeps restarting.

 

Thanks!