A method and apparatus for protecting file data is provided that combines or merges revision based backup with backup based on time intervals. One embodiment is directed to a method for protecting data contained in a file of a computer system, wherein the computer system is useable to create multiple...http://www.google.com.tw/patents/US7720819?utm_source=gb-gplus-share專利 US7720819 - Method and apparatus combining revision based and time based file data protection
