docs: 📝 add back up guide (#196)

docs/operator-guide/tutorials/backups.md

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+# Backing up Orion database
+It is recommended to schedule daily backups for the `orion-db` service.
+This will ensure that a copy of the whole database is saved daily to be used for emergencies
+This guide shows a simple method in order to back up `orion-db` using the [cron](https://en.wikipedia.org/wiki/Cron) utility.
+
+Suppose you want to back up orion a daily cron job at 9:00 AM CET. Provided that the `orion-db` service is being run in a docker container, you can follow these steps:
+
+1. Open your crontab file for editing. You can do this by running the following command:
+
+```bash
+crontab -e
+```
+
+2. Add the following line to your crontab file. This line schedules the job to run every day at 9:00 AM CET:
+
+```bash
+0 9 * * * TZ='Europe/Paris' docker exec orion-db pg_dumpall -U postgres > "/path/to/backup/directory/orion-production-$(date '+\%Y-\%m-\%d').bak"
+```
+
+Make sure to replace `/path/to/backup/directory` with the actual path where you want to store the backup files.
+
+Here's what each field in the cron expression means:
+
+- `0`: Minutes field, specifying 0 minutes past the hour.
+- `9`: Hours field, specifying 9 AM.
+- `*`: Wildcard for days of the month, meaning it will run every day.
+- `*`: Wildcard for months, meaning it will run every month.
+- `*`: Wildcard for days of the week, meaning it will run every day of the week.
+- `TZ='Europe/Paris'`: Sets the timezone to CET (Central European Time) to ensure it runs at 9:00 AM CET.
+
+3. Save and exit the crontab file. The cron job is now scheduled to run daily at 9:00 AM CET and will dump the PostgreSQL database to the specified backup file with the current date in the filename.