Hi,

Yes, you can run Odoo Community Edition entirely offline for a year or more, focusing on core business apps like Inventory, POS, and Purchase, while excluding the Website app. To do this, install Odoo on your Linux distribution, ensuring you have all dependencies and configure it to use a local PostgreSQL database.

For long-term offline use, remember that you won't receive automatic updates or bug fixes, so be aware of potential security vulnerabilities. Regularly back up your Odoo database and store backups separately. Ensure your server's time is accurate, and note that any third-party integrations requiring internet access will not work. Download the Odoo documentation for your version. For the POS app, configure offline mode and ensure hardware compatibility. Accurately track stock levels for Inventory and maintain vendor information for Purchase. While you can generate financial reports offline with Accounting, you'll need to synchronize data when you reconnect to the internet. It's recommended to perform the initial setup with an internet connection, implement a robust backup strategy, and document your Odoo configuration.

Hope it helps