Transfer iPhone backup settings from old pc to new mac

While not a direct answer, I have found that finding info here in Apples Knowledge Base not very friendly. However, using Google to do it for me makes it far easier. Here is a sample search: http://www.google.com/search?num=30&hl=en&newwindow=1&q=iphone+transfer+backup+files+site%3Asupport.apple.com%2Fkb Note how I told it to only search Apple's knowledge base. This may help you find the answer you are looking for faster.   Windows XP Pro   iPhone (1st Gen) | AppleTV

Hey I'm currently running my iPhone from a laptop running iTunes on XP but am hoping to buy a mac to replace it because it's old and the performance isn't great these days. I know that when I plug my iPhone into my current laptop it backs up my settings, saves my texts etc but what will happen if I plug it into a totally new computer? I don't want to lose my messages etc when I get a new computer, so do I need to somehow transfer the backup that is saved on my pc to the new computer before syncing the iPhone or will it backup automatically when I plug it in for the first time without me actually losing any data? I can't find a tutorial for this anywhere, only for transferring from phone to phone... Sony VAIO FS485B / Asus eeePC 901   Windows XP   iPhone 8GB