Should I back up my laptop when upgrading for the beta

I have a 2010 i7 2.66 GHz macbook pro. I have never backed it up because I don't have the money to buy an external hard drive. I really want to participate in the OSX Yosemite beta program. I am always a fan of new OS's and would like to try it out. How ever, I have some video games I have downloaded and music and my garage band projects. I really dont want to start over. If I try out for the beta will I lose everything on my computer? FYI I am downloading from apples official website so it is completely legal. Thanks in advance.
- [FOXY]

Foxy754 wrote:
I have 320 gbs on my current internal, so Im looking for a way to just save all of my pictures and songs. I have a lot of music and a lot of pictures. My hard drive I bought with the computer needs to be replaced because I will really need a lot more. What is the difference between a SSD (which I assume means Solid Slate Drive) and HDD (Which I have no idea what that means.)
Your internal storage has 320GB, but drives that small aren't common anymore. The minimum price for external drives of various sizes is around $65-70. What I mean by that is you might as well get a 1TB (1000GB) drive for backup, because if you buy a smaller one it's not going to be that much cheaper than the 1TB these days. Here is an example - Western Digital 1TB external - the 500GB version only saves you $10. If you are really truly strapped for cash then I guess you could save the $10 and get the 500GB, because it's still big enough to back you up. But $10 more doubles the size to 1TB. The extra capacity would let Time Machine save more versions of your backups going back further in time.
Up to now most internal storage has been HDD (hard disk drive). It spins fast, moving parts means more prone to failure. The industry is transitioning to SSD (Solid State Drive). SSD has no moving parts so it is more reliable, and SSD is also many times faster than an HDD. All new Apple laptops use SSD.
But I don't know why you are being told to get an SSD, because if you are low on money you can get the same capacity for much less. Above I linked to a 1TB HDD for $70. An SSD version of that would cost almost $600...8x as much as the same size HDD! Maybe a little less if you put it together yourself, but you wouldn't really save that much. Forget about the SSD for now because it would not speed up your backup. You would be unable to take advantage of the SSD's speed because the transfer speed between the two drives would be limited by the fact that your current internal HDD is unable to feed data at the speed that the SSD can take it.
SSDs are fantastic, I just ordered one myself to upgrade in my MacBook Pro. But they are not practical for someone on such a tight budget. Better to wait until the technology matures and the price comes down more. For now, save your money and get an external HDD.
Other answers: I don't know about the screws. A store like ifixit.com, which stocks Mac parts, may have some if your computer store doesn't. Also, I would not recommend an online backup service for your immediate purpose for a couple of reasons: It would take you weeks to upload your hundreds of GB, and you would not be able to quickly reconstruct your bootable system from it. An online backup is more of a supplement to an immediately usable local backup, better for restoring individual files, not entire disks.

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