As the thread originator, I have a very good reason why I do *NOT* extract automatically, and therefore would like to please reaffirm the request to periodically save the PAR2 status information.
Did you ever have a 60GB harddrive crash? If so, how much of the 60GB did you manage to recover?
I did, and got back 99% of the data, but *only* because it was basically all RAR'd material with at least 15mb of PAR2's for each folder of RAR's. When the drive crashed, I got it mechanically going again, but the FAT was totally scrambled, all of the directory listings looked like greek characters (on offence to the Greeks reading this...). When I ran recovery software on it, it found about 90,000 files, but named them all File00001.fil etc. Quite a mess and a lot of heartburn, but using a search tool, I was able to find out which files had PAR2 in their headers and which ones had RAR in the headers and do some basic renaming from the header information, then by painstakingly running the PAR2's over a few weeks, Quickpar eventually found all of the RAR files and renamed and repaired the RAR sets, losing virtually nothing!
Try that with a drive of stuff that had been extracted and the PAR2's deleted - you'd have lost the whole 60GB I bet.
So now, my personal strategy is download whatever it is I'm downloading, *AND* at least 15mb of PAR2's whether or not they are needed, and save it all as is until such a time as I get around to burning it, and then extract it only just before.
PAR2 works exactly the same as a server's RAID controller and is a very good 2ndary backup - you should never delete them if you want your data to remain intact.
Cheers,
The REAL Joe