Render Files Disappearing

Question, I'm creating a variety of short (1-3 minute) videos in FCP 7, primarily a combination of various Motion .motn files embedded in the sequences. The problem I'm having is the render files are disappearing after only a couple of days. This means I keep having to re-render the .fcp projects whenever I want to work with them. I have a dedicated Scratch disk with over 150GB free.
What is FCP's algorithim for deleting render files? Are there any settings I can configure to have FCP hold onto or not delete any render files for a certain time?
Thanks!
lance

Up to now I have been importing the Motion .motn files directly into FCP. But I'm beginning to think you have the right approach. Export Motion files into ProRes, then import that into FCP.
Another problem I'm running into is if I open .motn file, and don't even edit it but just then close it also, when I open FCP it complains about the .motn file being unlinked.
ProRes and not embedded .motn files may be the way to go ...
lance

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