G'day bhutch - welcome!
To expand on what Tez and Zonk said, the Resmed only keeps the detailed data for a short period on the SD card, then starts over-writing it. You need to make sure you download the data from your SD card weekly. Both ResScan and SleepyHead will save the data onto your hard drive - SH does it automatically and with ResScan you have to remember to save it before you exit the program.
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Odd, I just open rescan and went back to the beginning, Oct 18th, when I started with the Autoset. All of the detailed data is there and is there for everyday except there are two days back when I was mishandling my SD card and I lost those two days. I do NOT back up my data in the Rescan folder, so I could not be picking up my backup folder.
Every time I open Rescan I use a customized report which selects ALL the data, it is a five page report. It saves it as an Adobe PDF file. I have one for every day just in case I need it. I don't print them, just save them for a rainy day or another data mishap. These PDFs are not tied to any database or my machine.
WELCOME! to the forum.!
If your data is downloaded timely and saved in ResScan, it will not go away as long as you select discard rather than overwrite.
Thanks guys for the prompt responses. Although my post was my first here I have been lurking for quite a while. I appreciate the work you guys do and it is obvious from the many times I have seen your tags that this is a very helpful community.
It looks like I will have to remember to set up another weekly job. I thought that after retirement life would get simpler. Not so! Now if only I could connect the S9 to the household network - There's an idea ResMed.