I'm not sure what you mean by "note8 calendar", as the calendar app is simply displaying events that are entered from the calendar sources you select.
Try going to the calendar app and tap the three dots in the upper right. Select "Manage Calendars". From here, you can turn on and off calendars as you need them (or not). Your events may not be showing up because you have your primary calendar turned off. Just switch it on.
For example, the only calendar I use to schedule things is my Gmail account that I use for phone-related things (calendar, contacts, apps, etc). All my regular email accounts are turned off, as is Samsung, because I don't use those calendars. If your primary calendar is linked to your Gmail account, it is constantly backed up up to your Google account. If it's a Samsung account, it should be backed up to your Samsung account (but contact them and make sure).