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+Backups are made every 4 hours.
+Every day at 8:30 PM, irrelevant backups are forgotten.
+Every friday at 10:00 AM, all backups marked irrelevant are removed.
+
+Backup retention policy:
+We always keep the last 20 backups.
+We keep one backup per day from the last 20 days.
+We keep one backup per week from the last 20 weeks.
+We keep one backup per month from the last 6 months.
+We keep one backup per year from the last 10 years.
+
+This means we never lose data, just the ability to grab a backup from a specific time.