XP OS and Netscape OT

This is off the topic of Classic Computers but in 10 years it will be on topic. I just want to get some answers NOW so that maybe this computer will be around in 10 years. I run XP and Netscape 7.2 I would like to make a backup on CD-RW once a month. In the old days when storage space was precious there were programs that allowed you to backup ONLY the files on the computer that had been updated or added since the last backup. I would like to do the same but haven't found the method. OR in the alternative, I would like to do a FULL backup to a second HD that WOULD BE BOOTABLE by just swapping the HD when the main drive craters, which seems to be the main failure I have, about once every two years. Secondly I would like to know how the save on a floppy or CD all my Netscape email archives and address book and Web Bookmarks and then how to merge them BACK into a new install of Netscape without erasing what is already there. The last time my HD cratered I had saved the address book but nothing else but I could never get it back on to the new install.