How do I back up my notes?
To create backup, you need to go File - Export/Backup and select Export notes to JSON. Then, you need to enter the name of the backup file. It's important to point out that when backup is created, all attached files are exported and placed into a new folder, so it's best to create a separate folder for the entire backup to avoid confusion.
How do I restore notes from backup?
You need to go File - Import and select item Import from Nimbus JSON. Then, find the backup file, click OK and wait a moment while files are being imported.