Scenario 6: Write a script that creates timestamped daily backups, uploads them to AWS S3, and automatically purges old backups from the bucket that are older than 30 days.

import os
import shutil
import boto3
from datetime import datetime, timezone, timedelta

# Config
BACKUP_DIR = "/opt/app/data"
S3_BUCKET = "my-company-backups"
date_suffix = datetime.now().strftime("%Y_%m_%d")
archive_name = f"/tmp/backup_{date_suffix}"

# 1. Create timestamped backup
archive_file = shutil.make_archive(archive_name, 'zip', BACKUP_DIR)
s3_key = os.path.basename(archive_file)

# Initialize AWS clients
s3 = boto3.client("s3")
s3_res = boto3.resource("s3")

try:
    # 2. Upload to S3
    s3.upload_file(archive_file, S3_BUCKET, s3_key)
    print(f"Uploaded {s3_key} to S3 bucket.")
    os.remove(archive_file) # Remove local copy
    
    # 3. Purge objects older than 30 days
    bucket = s3_res.Bucket(S3_BUCKET)
    now_utc = datetime.now(timezone.utc)
    expiration_limit = now_utc - timedelta(days=30)
    
    for obj in bucket.objects.all():
        if obj.last_modified < expiration_limit:
            print(f"Purging expired backup object: {obj.key} (Modified: {obj.last_modified})")
            obj.delete()
            
except Exception as e:
    print(f"Backup operation failed: {e}")