In a backup folder, there are some standard files with fixed names and contents and hundreds of files with long hashed filenames consisting of 40 hexadecimal characters. The file name acts like a unique identifier for every file copied from the iDevice. In fact, each file is named as the result of an SHA-1 hash calculated on the original full name of the file in the following form:
Consider the following example:
AppDomain is the name of domain,
Com.skype.skype is the subdomain, and
Library/Preferences/com.skype.skype.plist is the path and the name of file.
Calculating the SHA-1 hash for