{
"title": "Migrating from Google Calendar to a Self-Hosted CalDAV Server: A Step-by-Step Guide",
"titles": [
"Migrating from Google Calendar to a Self-Hosted CalDAV Server: A Step-by-Step Guide",
"The Trials and Tribulations of Leaving Google Calendar for My Own CalDAV Setup",
"Technical Deep Dive: Migrating Google Calendar Data to Nextcloud\u2019s CalDAV Implementation"
],
"outline": [
"The trigger: Aundrea asks why the family calendar is empty",
"The Google Calendar dependency audit",
"Choosing Radicale over NextCloud (simplicity wins)",
"The migration: icalendar + caldav Python scripts",
"Setting up Cloudflare Email Worker for webhook parsing",
"The moment it worked: seeing events sync to phones",
"What I'd do differently next time"
],
"draft": "# Migrating from Google Calendar to a Self-Hosted CalDAV Server: A Step-by-Step Guide\n\n## The Trigger\n\nIt all started on a Sunday morning when my wife, Aundrea, asked why our family calendar was suddenly empty. This wasn't just any random glitch; it was the moment that pushed me into action. We were relying heavily on Google Calendar for everything\u2014work meetings, kids\u2019 soccer practices, and personal appointments. The dependency had become an unspoken crutch until it broke.\n\nI realized then how brittle our setup was: a single point of failure sitting in someone else\u2019s server farm. It was time to gain control over our calendar data. So I set out on this migration project to bring everything under our own roof with a self-hosted CalDAV server.\n\n## The Google Calendar Dependency Audit\n\nFirst, I took stock of what we had tied into Google Calendar. I meticulously cataloged every event, recurring schedule, and integration point\u2014like reminders synced across devices and third-party apps that fed data in or out. This audit was crucial to ensure no detail would be overlooked during the migration.\n\nI also checked when our dependency began, backtracking through settings and sync histories. It turned out we'd been using Google Calendar for over five years, which meant a fair amount of historical data to transfer.\n\n## Choosing Radicale Over NextCloud (Simplicity Wins)\n\nChoosing the right tool was another challenge. I considered NextCloud but decided on Radicale after weighing both options. While NextCloud offered more features and integrations, it also introduced complexity that could bog us down\u2014features we didn\u2019t necessarily need for a calendar server.\n\nRadicale, on the other hand, promised simplicity without sacrificing functionality. It was straightforward to deploy and configured with minimal fuss, which aligned perfectly with our goal of reducing dependency headaches in the future.\n\n## The Migration: icalendar + caldav Python Scripts\n\nWith Radicale chosen, it was time for data migration. I wrote custom Python scripts using icalendar and caldav libraries to fetch events from Google Calendar and push them into Radicale. This process involved several iterations:\n\n1. Fetch Events: The first script used the Google Calendar API (google-api-python-client) to export all calendar data, which resulted in a large iCalendar file.\n \n python\n from googleapiclient.discovery import build\n from google.oauth2.credentials import Credentials\n\n creds = Credentials.from_authorized_user_file('token.json')\n service = build('calendar', 'v3', credentials=creds)\n\n # Fetch all events\n result = service.events().list(calendarId='primary', singleEvents=True, orderBy='startTime').execute()\n\n\n2. Parse and Upload: The second script parsed the iCalendar file using icalendar to extract individual events and then used the caldav library to upload these events to Radicale.\n\n python\n from icalendar import Calendar\n import caldav\n\n # Parse the calendar file\n with open('events.ics', 'rb') as f:\n gcal = Calendar.from_ical(f.read())\n\n client = caldav.DAVClient(url='http://localhost:5232/', username='user', password='pass')\n principal = client.principal()\n calendar = principal.calendars()[0]\n \n # Upload events\n for component in gcal.walk():\n if component.name == \"VEVENT\":\n event = calendar.add_event(component)\n\n\nChallenges were inevitable. I encountered numerous permission errors initially, as my scripts were trying to access Google Calendar data with insufficient credentials. Adjusting the OAuth scopes in token.json helped resolve these issues.\n\n## Setting Up Cloudflare Email Worker for Webhook Parsing\n\nI wanted real-time synchronization between our devices and Radicale. To achieve this, I set up a Cloudflare Email Worker that would listen for email notifications from Google Calendar (enabled via calendar settings) and parse these to update Radicale accordingly.\n\nThe parsing logic was straightforward but required careful error handling to manage malformed emails or unexpected data formats:\n\njavascript\naddEventListener(\"email\", event => {\n const mail = new MailParser();\n mail.on(\"headers\", headers => {\n // Check for Google Calendar notifications\n if (headers.subject.includes(\"[Calendar]\")) {\n parseGoogleNotification(headers, body);\n }\n });\n \n mail.parse(event.data.text());\n});\n\n\nThe trickiest part was ensuring the worker ran reliably under Cloudflare's constraints. I had to fine-tune resource allocations and manage rate limits after encountering 503 Service Unavailable errors.\n\n## The Moment It Worked: Seeing Events Sync to Phones\n\nAfter weeks of debugging, late nights, and countless iterations, everything finally came together on a quiet Tuesday evening\u2014March 15th at precisely 7:45 PM. I saw events syncing across all our devices for the first time with Radicale in control. The moment was both relieving and validating; it confirmed that we had successfully migrated away from Google Calendar.\n\nSeeing those notifications pop up on Aundrea's phone, confirming her dentist appointment synced seamlessly, felt like a personal victory.\n\n## What I'd Do Differently Next Time\n\nReflecting on this migration, there are several areas for improvement:\n\n1. Testing Environment: Setting up a local test environment to simulate the migration would have caught some errors early. It\u2019s something I\u2019ll definitely establish next time.\n \n2. Script Error Handling: More robust error handling in my scripts could have reduced downtime during initial runs.\n\n3. Documentation: Documenting each step more thoroughly as I went along, rather than relying on memory, would save future headaches.\n\n4. Rate Limit Awareness: A deeper understanding of Cloudflare's rate limits and how they interact with Email Workers would have streamlined the webhook setup.\n\n### Actionable Takeaways\n\n- Audit your dependencies comprehensively before making a change.\n- Choose tools that balance simplicity with functionality to avoid unnecessary complexity.\n- Develop thorough testing environments for major migrations or integrations.\n- Implement robust error handling in scripts to anticipate and manage failures gracefully.\n- Document every step meticulously\u2014this will pay dividends in troubleshooting and future projects.\n\nIn conclusion, migrating from Google Calendar to a self-hosted CalDAV server was no small feat. It required careful planning, execution, and a willingness to learn on the fly. But with Radicale up and running, our family calendar is now more resilient and under our control\u2014ready for whatever unexpected events life throws our way.",
"seo": {
"excerpt": "It all started on a Sunday morning when my wife noticed our family calendar was empty. This unexpected glitch pushed me to migrate from Google Calendar to a self-hosted CalDAV server.",
"tags": "Google Calendar, CalDAV, Self-Hosting, Migration Guide, Technical Writing, Home Infrastructure, Data Privacy",
"meta_description": "A practical guide for migrating from Google Calendar to a self-hosted CalDAV server. Learn step-by-step processes and technical tips."
},
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"generated_at": "2026-04-21T16:37:29.471343",
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}