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pgm_bckp/README.md

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+# 📦 Requirements
+
+```bash
+sudo apt update
+sudo apt install mariadb-client postgresql-client
+```
+
+# ⚠️ Common Issues and Fixes
+
+### ❌ mysqldump: command not found
+### Cause: MySQL client is not installed.
+
+Fix:
+```bash
+sudo apt install mariadb-client
+```
+
+### ❌ pg_dump: command not found
+
+### Cause: PostgreSQL client is missing.
+Fix:
+```bash
+sudo apt install postgresql-client
+```
+
+### ❌ pg_dump: error: aborting because of server version mismatch
+
+### Cause: The local pg_dump is version 15, while the remote PostgreSQL server is version 17.
+Fix: Install pg_dump version 17 from the official PostgreSQL (PGDG) repository:
+```bash
+# Add the official PostgreSQL repository
+echo "deb http://apt.postgresql.org/pub/repos/apt/ bookworm-pgdg main" | sudo tee /etc/apt/sources.list.d/pgdg.list
+wget --quiet -O - https://www.postgresql.org/media/keys/ACCC4CF8.asc | sudo gpg --dearmor -o /etc/apt/trusted.gpg.d/pgdg.gpg
+sudo apt update
+
+# Install the PostgreSQL 17 client
+sudo apt install postgresql-client-17
+
+```
+
+
+# ⏰ Automating via Cron
+
+Open your crontab:
+
+```bash
+crontab -e
+```
+
+Add a line like this to run the script daily at 1 AM:
+```bash
+0 1 * * * /path/to/backup.sh >> /path/to/logs/backup.log 2>&1
+```
+
+# 🔐 Security Tips
+Restrict access to the config file containing credentials:
+
+```bash
+chmod 600 config.sh
+```

pgm_bckp/backup.sh

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+#!/bin/bash
+
+SCRIPT_DIR="$(cd "$(dirname "${BASH_SOURCE[0]}")" && pwd)"
+source "$SCRIPT_DIR/config.sh"
+
+# Check if required commands are available
+missing=0
+
+command -v mysqldump >/dev/null 2>&1 || { echo "❌ mysqldump not found. Install it with: sudo apt install mariadb-client or sudo apt install mysql-client"; missing=1; }
+command -v pg_dump >/dev/null 2>&1 || { echo "❌ pg_dump not found. Install it with: sudo apt install postgresql-client"; missing=1; }
+
+if [ "$missing" -eq 1 ]; then
+    echo "❌ Aborting: Required tools are missing."
+    exit 1
+fi
+
+
+mkdir -p "$backup_dir"
+
+for db_id in "${database_ids[@]}"; do
+    IFS='|' read -r db_type db_name db_host db_port db_user db_pass <<< "${!db_id}"
+    timestamp=$(date +%Y%m%d%H%M%S)
+    backup_file="$backup_dir/$db_name-$timestamp.sql"
+
+    case "$db_type" in
+        mysql)
+            mysqldump --user="$db_user" --password="$db_pass" --host="$db_host" --port="$db_port" --databases "$db_name" > "$backup_file"
+            ;;
+        postgres)
+            export PGPASSWORD="$db_pass"
+            pg_dump --username="$db_user" --host="$db_host" --port="$db_port" --format=plain --file="$backup_file" "$db_name"
+            ;;
+        *)
+            echo "❌ Unsupported database type: $db_type for $db_name"
+            continue
+            ;;
+    esac
+
+    if [ $? -eq 0 ]; then
+        echo "✅ Backup of $db_type database '$db_name' completed: $backup_file"
+    else
+        echo "❌ Error during backup of $db_type database '$db_name'"
+        rm -f "$backup_file"
+    fi
+
+    # Cleanup
+    find "$backup_dir" -type f -name "$db_name-*.sql" -mtime +$backup_retention_days -exec rm -f {} \;
+done

pgm_bckp/config.sh

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+# Backup destination and retention
+backup_dir="db_backup"
+backup_retention_days=7
+
+# List of database identifiers
+database_ids=("db1" "db2" "pg1")
+
+# For each database, define its parameters
+# Format: type|name|host|port|user|password
+
+db1="mysql|db1|127.0.0.1|3306|root|rootpass"
+db2="mysql|db2|10.0.0.2|3307|backup_user|backup123"
+pg1="postgres|my_pgdb|192.168.1.100|5432|pguser|pgpass"