There are different approaches you can take here.
- After sending the sticky note, you can stick the note to some other memoboard for future reference. When you stick the note to another memoboard, Notezilla will ask you whether you want to remove it from the desktop.
- You can straight away create a sticky note in a memoboard (instead of the desktop). Right click on Notezilla icon and choose New Note By->Memoboard
Once you follow the above, optionally you can go to File->Export in Notes Browser and export all notes from a memoboard to an HTML file. Or just leave them in that memoboard. You can also keep deleting the sticky note and export notes from Trash to HTML file before emptying the trash.