Firstly, everyone on a PC is terrified of Apple’s ProRes Codec because they say that it doesn’t run on Windows.
Feh. You can download it here. There is an issue with gamma shift, but it’s not so bad that, for archival purposes, you couldn’t restore it on a Windows sysem for viewing the archive or for a quick insert into a later program (with a moderate CC).
I don’t like using a long GOP MPEG compression for archival purposes. I have had to edit with that and there are really nasty “Max Headroom” issues with restored footage from those kinds of archives, so Paul’s idea is very sound.
I would highly recommend that Paul use Mike Bombich’s excellent Carbon Copy Cloner to clone his current version of Final Cut Pro (the whole boot drive!) for archive restoration. Apple may change their codec, they may change how Final Cut works with the codec, etc. And as long as the cloned boot drive is viable (Paul has an old enough Mac to boot that operating system), he should be able to recover any archived material that way.
In fact, I recommend that anyone on a Mac clone their boot drive so that Software Update or some add-on doesn’t bork a system that works (and these things tend to happen in the middle of production with a client looking over your shoulder). If you keep a backup of your projects and clone your boot drive, all you have to do is reboot from the clone, access your project and get back to work.
On the PC side, I recommend using O&O Software’s Disk Image to create a bootable spare. If all you are doing is fiddling around, it’s not that important, but if you are a pro and editing and producing for real money, it pays to have a “last known good” installation.
What if there were no hypothetical questions?