backup half life 2 files?

[wesley]

hi guys

my half life 2 CD doesnt work when i tried install HL2, havent played it for long time so i downloaded HL2 via steam and would like to back up the files to blank CD but which folders/files?

cheers

PS how can i re-install HL2 in the future from backup CD?

 

[wesley]

thanks guys

failed to copy a file from CD then aborted!