Apple's goal with this program is largely to solicit feedback about Yosemite, particularly about its new UI. If there are things that aren't working, are confusing, seem like they should work better, or that you really dislike, you should report them to Apple using the Feedback Assistant that's included. During the public beta prior to the release of OS X in 2000, Apple made several changes based on user feedback -- the most obvious was restoring the Apple menu in the shipping version of OS X, which had been replaced with an Apple logo in the middle of the menu bar.
If you only have one Mac or you decide to ignore my advice and install Yosemite on your primary machine, you should at least consider putting the beta on a drive that isn't your typical startup drive (usually the internal hard drive or SSD inside your Mac). You can install the beta on an external drive, a second internal drive (if your Mac has one), or a hard-drive partition. You can then boot from that drive or partition when you want to use the beta and boot up from your primary startup drive when you need to get things done.
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Another option, if you have a copy of Parallels Desktop or VMWare Fusion, is to install the Yosemite beta on a virtual machine. Although these tools are typically used to create virtual machines running Windows, they do support other operating systems, including OS X, meaning you can create a virtual Mac and install the Yosemite beta on it. That also reduces -- but doesn't entirely remove -- the risk of problems. If you go this route, you'll want to disable any features that allow the virtual machine to exchange files with your physical Mac to minimize potential data loss if there's a file system issue.
Several key Continuity features aren't included. Apple lists phone calls, SMS, Handoff, Instant Hotspot and iCloud Drive as features that aren't fully baked enough to be included in the beta. Several of those require iOS 8, which Apple is not making available in a prerelease state to beta testers (though members of Apple's iOS developer program do have access to preview releases of iOS 8).
Your experience, however, is likely to be poor and performance notably slower if you use a Mac that just barely meets the requirements. Although it's difficult to gauge at this point what would be ideal, 4GB is probably the lowest amount of RAM that would enable decent performance (as it is with a Mac running Mavericks). As with most things in computing, the more memory you have, the better. 2ff7e9595c
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