Simple Timestamped File and Directory Backup

#!/bin/bash

# Configuration
SOURCE="/var/www/mywebapp/config.js" # File or directory to backup (e.g., /etc/nginx/nginx.conf or /var/www/mywebapp)
BACKUP_DIR="/var/backups/mywebapp" # Directory where backups will be stored

TIMESTAMP=$(date +%Y%m%d%H%M%S)
FILENAME=$(basename "$SOURCE")

# Create backup directory if it doesn't exist
mkdir -p "$BACKUP_DIR"

# Check if source exists
if [ ! -e "$SOURCE" ]; then
    echo "Error: Source '$SOURCE' not found. Aborting backup."
    exit 1
fi

# Perform backup based on source type
if [ -f "$SOURCE" ]; then
    # Source is a file
    echo "Creating timestamped backup of file: $SOURCE..."
    # Create a backup with timestamp before the file extension
    cp "$SOURCE" "$BACKUP_DIR/${FILENAME%.*}.$TIMESTAMP.${FILENAME##*.}"
    if [ $? -eq 0 ]; then
        echo "File backup successful: $BACKUP_DIR/${FILENAME%.*}.$TIMESTAMP.${FILENAME##*.}"
    else
        echo "Error: Failed to create file backup."
        exit 1
    fi
elif [ -d "$SOURCE" ]; then
    # Source is a directory
    echo "Creating compressed timestamped backup of directory: $SOURCE..."
    # Create a compressed tar archive of the directory
    tar -czf "$BACKUP_DIR/${FILENAME}_$TIMESTAMP.tar.gz" -C "$(dirname "$SOURCE")" "$(basename "$SOURCE")"
    if [ $? -eq 0 ]; then
        echo "Directory backup successful: $BACKUP_DIR/${FILENAME}_$TIMESTAMP.tar.gz"
    else
        echo "Error: Failed to create directory backup."
        exit 1
    fi
else
    echo "Error: Source '$SOURCE' is neither a file nor a directory. Aborting."
    exit 1
fi