Last reviewed Jan 16, 2026

NimbleCal is local-first, which is great for reliability. But it also means you should treat backups as a habit, especially before big changes.

The easiest backup: export an .ics file

The most portable backup format is iCalendar (.ics).

See: Export calendars (ICS)

What gets exported?
ICS export includes the standard calendar event fields (like titles, times, locations, notes, recurrence, and reminders). Some app-specific settings (like theme and view preferences) are not part of the iCalendar format.

When you should export a backup

Export first if you're about to:

  • Clear browser storage / site data
  • Move to a new computer or browser profile
  • Do a big import (so you have a rollback point)
  • Make lots of edits you can't easily undo

Restoring from a backup

To restore, import the .ics file back into NimbleCal:

Heads up: imports can create duplicates
If you import the same backup more than once, you'll likely see duplicate events. If you're unsure, import into a new calendar first so it's easy to clean up.