# Nextcloud — Self-Hosted Cloud Platform for Files, Calendar & More

> Nextcloud is the leading open-source cloud platform for file sync, sharing, calendar, contacts, email, video calls, and office collaboration — a Google Workspace alternative.

## Install

Save the content below to `.claude/skills/` or append to your `CLAUDE.md`:

## Quick Use

```bash
docker run -d --name nextcloud -p 8080:80 
  -v nextcloud-data:/var/www/html 
  nextcloud:latest
```

Open `http://localhost:8080` — create your admin account and start using your private cloud.

## Intro

**Nextcloud** is the leading open-source self-hosted cloud platform, providing file sync and sharing, calendar, contacts, email, video conferencing, office document editing, and dozens more productivity tools. It serves as a comprehensive alternative to Google Workspace, Microsoft 365, and Dropbox — all running on your own infrastructure.

With 34.6K+ GitHub stars and AGPL-3.0 license, Nextcloud is trusted by millions of users and thousands of organizations worldwide, from individuals to government agencies and enterprises requiring data sovereignty.

## What Nextcloud Does

Nextcloud provides a complete productivity suite:

- **Files**: Sync, share, and collaborate on files across all devices with end-to-end encryption option
- **Calendar**: CalDAV calendar with scheduling, invitations, and room booking
- **Contacts**: CardDAV contact management synced across devices
- **Talk**: Video conferencing, screen sharing, and team chat (like Zoom + Slack)
- **Office**: Built-in document editing with Collabora Online or OnlyOffice integration
- **Mail**: Email client integrated into the Nextcloud interface
- **Deck**: Kanban board for project management
- **Notes**: Markdown note-taking with mobile sync
- **Photos**: AI-powered photo management with face recognition and albums

## Architecture

```
┌──────────────┐     ┌──────────────┐     ┌──────────────┐
│ Web / Desktop│────▶│  Nextcloud   │────▶│  MySQL /     │
│ / Mobile App │     │  Server (PHP)│     │  PostgreSQL  │
└──────────────┘     └──────┬───────┘     └──────────────┘
                            │
              ┌─────────────┼─────────────┐
              │             │             │
       ┌──────┴──┐   ┌─────┴───┐   ┌─────┴───┐
       │  Redis  │   │ Storage │   │Collabora│
       │  (Cache)│   │(Local/S3)│  │ (Office)│
       └─────────┘   └─────────┘   └─────────┘
```

## Self-Hosting

### Docker Compose (Production)

```yaml
services:
  nextcloud:
    image: nextcloud:latest
    ports:
      - "8080:80"
    environment:
      MYSQL_HOST: db
      MYSQL_DATABASE: nextcloud
      MYSQL_USER: nextcloud
      MYSQL_PASSWORD: nextcloud
      NEXTCLOUD_ADMIN_USER: admin
      NEXTCLOUD_ADMIN_PASSWORD: your-admin-password
      REDIS_HOST: redis
    volumes:
      - nextcloud-data:/var/www/html
    depends_on:
      - db
      - redis

  db:
    image: mariadb:11
    environment:
      MYSQL_ROOT_PASSWORD: root-password
      MYSQL_DATABASE: nextcloud
      MYSQL_USER: nextcloud
      MYSQL_PASSWORD: nextcloud
    volumes:
      - db-data:/var/lib/mysql

  redis:
    image: redis:7-alpine

volumes:
  nextcloud-data:
  db-data:
```

## Key Features

### App Ecosystem

Nextcloud has 400+ apps in its App Store:
- **Productivity**: Calendar, Contacts, Tasks, Notes, Deck, Bookmarks
- **Communication**: Talk (video), Mail, Circles (groups)
- **Office**: Collabora Online, OnlyOffice, Markdown Editor
- **Security**: Two-Factor Auth, End-to-End Encryption, Audit Log
- **Integration**: External Storage (S3, SMB, FTP), LDAP/AD, SSO

### Desktop & Mobile Sync

Native sync clients for all platforms:
- **Desktop**: Windows, macOS, Linux — auto-sync files like Dropbox
- **Mobile**: iOS and Android with auto-upload for photos/videos
- **WebDAV**: Standard protocol, compatible with any WebDAV client

### Enterprise Features

- LDAP/Active Directory integration
- SAML/SSO authentication
- Audit logging and compliance
- File access control and retention policies
- Branding and theming

## Nextcloud vs Alternatives

| Feature | Nextcloud | Google Workspace | Microsoft 365 | Seafile |
|---------|-----------|-----------------|---------------|---------|
| Open Source | Yes (AGPL-3.0) | No | No | Partial |
| Self-hosted | Yes | No | Partial | Yes |
| Office suite | Collabora/OnlyOffice | Google Docs | Office Online | SeaDoc |
| Video calls | Nextcloud Talk | Google Meet | Teams | No |
| Calendar/Contacts | Built-in | Built-in | Built-in | No |
| E2E Encryption | Yes | No | No | No |
| App ecosystem | 400+ apps | Marketplace | AppSource | Limited |
| Pricing | Free (self-host) | $6/user/mo | $6/user/mo | Free (self-host) |

## FAQ

**Q: How's Nextcloud performance? Does large-file sync run fast?**
A: Performance depends on server configuration. Tune with Redis cache, OPcache, and PHP-FPM. Use chunked upload for large files. For teams of 10+ users, plan for 4GB+ RAM and SSD storage.

**Q: Can it replace Google Workspace?**
A: For file sync and collaboration, Nextcloud is a mature alternative. Pair it with Collabora Online for in-browser Office editing. Talk provides video conferencing. Mail is client-only (you need your own mail server). Overall, it covers 80%+ of Google Workspace use cases.

**Q: How do I back up Nextcloud?**
A: Back up three things: 1) the data directory (/var/www/html/data), 2) the database (mysqldump), and 3) the config file (config.php). Use cron to schedule regular off-site backups.

## Source & Thanks

- GitHub: [nextcloud/server](https://github.com/nextcloud/server) — 34.6K+ ⭐ | AGPL-3.0
- Website: [nextcloud.com](https://nextcloud.com)

---
Source: https://tokrepo.com/en/workflows/nextcloud-self-hosted-cloud-platform-files-calendar-more-e8506b82
Author: AI Open Source