If you use putty like myself, you may need to copy your saved session information from time to time. Putty uses the windows registry to store this information. In order to back this up, do a simple regedit dump:
From the Start->Run Dialog enter the following.
regedit /e “%userprofile%\desktop\putty.reg” HKEY_CURRENT_USER\Software\Simontatham
On your desktop will be a putty.key file that you can double click on to import the information back into the registry.