On tablet, the sticky notes are backed up automatically in Notezilla app. You can go to Settings / General to restore a previous backup. However, if you wish to restore sticky notes later on another device or PC, you need to create a sync account so that notes are synced with our cloud.
This way you can restore from the cloud anytime on any device.
I hope you are also using the Windows version of Notezilla . You can sync your notes with the Windows version too.
You can download and install Notezilla from our website https://www.conceptworld.com/Notezilla/Download