It saves it into your restore back up I believe. So you'd have to restore the new phone with the back up from the old phone then run pkgbackup to reinstall everything to the new phone.
I had some quirks with that very situation. Pkgbackup saves the data to a contacts entry, specifically the 'notes' section of the entry and if is named using the phone's serial (or ecid). In my case the contacts entry name is:
Pkg_526d8ad929530d......... Etc.
When you switch phones, because if different I'd, it won't see the backup data, you need to run pckbackup once and do a backup on the new phone then copy the 'notes' section from your original phone's backup over the notes section of your newly created entry.