No. Restores from Spanning Backup are "non-destructive", and will not overwrite existing calendars or events. Instead, each calendar item is placed into a newly created "Restored on (date)" calendar.
Do restored Microsoft 365 Calendars or Events overwrite existing Calendars or Events?
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- How are calendar events restored?
- What happens if I restore a calendar or event to an account different than the one from which it was backed up?
- Can I restore multiple Microsoft 365 events at one time?
- What happens if attendees are restored with Calendars?
- Where are restored Microsoft 365 Calendars and Calendar Events restored to?
- How do I search for Microsoft 365 events to restore?
- Do restored Microsoft 365 Calendars or Events overwrite existing Calendars or Events?
- Does Spanning back up Microsoft 365 Group Calendars?
- Does Spanning back up shared Microsoft 365 Calendars?
- What Microsoft 365 Calendars are included in the backup?
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