If you want to restore notes from your Notezilla sync account:
Right click on the Notezilla icon, choose Sync and sign into your existing account. This will download all your sticky notes that you have been syncing for last few years.
Notezilla keeps 5 copies of local backups. You can restore them using the Notezilla Troubleshooter app. Also, if you want to restore different sticky notes than what are on the cloud then use the Notezilla Troubleshooter app.
For more details, watch this short video that perfectly describes the feature: