I hope that someone can offer me assistance.
Im currently going through a dispute with a client about a project and need to get a backup of all of Skype correspondance including correspondacnce dating back further than 30 days. Is this possible?
My chat log goes back years. As long as your main.db file located in a sub folder of your username at : %appdata%\Skype isn't renamed, deleted or damaged your history will be there (i.e. %appdata%\Skype\yourSkypeName\main.db). If you used another computer at that time, you would have to go back to that computer to retrieve those logs.
If you are able to retrieve an older copy or just want to verify the historical contents of your existing file you can use 3rd party software like SkypeLogView to read the file.
My earlier response provided you guidance on how to access the main.db file from the computer. Each device whether it is portable, OSX/Windows/Linux uses the same file so you can transplant one to the other or maintain separate copies. Some 3rd party software could be used to join the logs of the two. If you need to access or replace the main.db file on your iPad, you can follow the guidance in one of my earlier posts.