So you have ripped all your music CDs on your hard drive, and you might be worried about what will happen to all these files if disaster strikes. You can copy them onto an external hard drive, or you can make a copy to an Internet-based backup service. I did a review of MP3Tunes’ Locker music service here on NewsForge/OSTG. The nice thing about this service is that it works across Mac, Windows, and Linux platforms. The bad thing is that the first time you use the service, it will take several days to upload all your data.