If you expand those, there are more options.
Within FS, you can use instant replay, to see the last vague moments of your flight. You can use the Flight Video tool to record a video of your flight, then play it back at any time. There is also a program called FS Recorder, which allows you to do roughly the same as the in-built Flight Video, but you have more options, such as being able to choose what parts of the flight are recorded, like smoke, AI, control surfaces, engines, etc.
Outside FS, making videos, like AVIs and MPGs, you can goolge a lot of recording software. The most well-known out there is FRAPS, but there are other like Game Cam. All of which will pretty much destroy your frame rates.
The third options is to buy a recorder PCI card, or a DVD recorder more commonly used for normal TV, and have FS record through that. There will not be any frame rate loss through the DVD recorder method, but the PCI card, unless it's on another computer, will probably take away some frames.
Hope that helps (or confuses you a little bit).
