El Capitan back to Yosemite

No, you'll likely get a warning that you can’t install an older version of Mac OS X over a newer one.

It's a pre-Beta in reality hence it being released only to Developers. Backup your data and internet recover your machine, or restore from an Time Machine Backup before you upgraded.

I won't upgrade a working OS to a Beta one for my main machine. I always add a test partition for the new version so I can run it alongside until it's stable and all my applications work.
 
We all make noob mistakes, remember my post from when I deleted my entire data by restoring my macbook? The state of me trying to get photos off my iPhone... :o
 
It's beta it's meant to be a pain in the backside. Unless you are a developer and you submit bugs don't play around with it unless you are to accept it's a pain in the backside and you don't need to ask questions like this. ;)

Oh I know, just haven't had these particularly annoying issues in previous betas. Namely printing not working and the Office 2015 bugging out!
 
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