Fortunately for me, I didn't have any problems installing 10.5.6. It worked fine on both of my machines, but I've been seeing a number of posts where people haven't been able to use their machines after attempting the update. If you are concerned about losing access to your machine there are a number of things you can do to ensure you don't lose your data.
1) Time Machine works. Protect your data by backing up with Time Machine before you start.
2) Install OSX to your external HD. I don't believe this violates any licensing agreement because you can still only use the OS on one drive at a time for the machine which the license came with. In the event of a 10.5.6 failure, you can boot from your external drive and OSX will mount your internal drive. While this won't prevent issues with the 10.5.6 install, you won't be left without any access to your machine if something goes wrong.
To take this a step further, when I first tried this, I booted off of the external drive and took an image using disk utility of my internal drive and stored that image on the desktop of the external drive. After installing Mac Pilot, my machine wouldn't boot. I was able to boot off the external drive and image my internal drive. The whole process took 20 minutes. After booting to the newly installed image, I imported from Time Machine and voila, back to where I started.
If you don't have an external HD, I recommend getting one.
Happy Holidays,
J
1) Time Machine works. Protect your data by backing up with Time Machine before you start.
2) Install OSX to your external HD. I don't believe this violates any licensing agreement because you can still only use the OS on one drive at a time for the machine which the license came with. In the event of a 10.5.6 failure, you can boot from your external drive and OSX will mount your internal drive. While this won't prevent issues with the 10.5.6 install, you won't be left without any access to your machine if something goes wrong.
To take this a step further, when I first tried this, I booted off of the external drive and took an image using disk utility of my internal drive and stored that image on the desktop of the external drive. After installing Mac Pilot, my machine wouldn't boot. I was able to boot off the external drive and image my internal drive. The whole process took 20 minutes. After booting to the newly installed image, I imported from Time Machine and voila, back to where I started.
If you don't have an external HD, I recommend getting one.
Happy Holidays,
J