I'm considering using AWS Backup for 2PB of S3 data. Per AWS pricing sheet, Backup service costs $0.05 per GB, while S3 Intelligent Tiering ranges from $0.023 to $0.004 per GB. This would cost about $100,000 per month for backups, compared to our current $25,000 in S3 expenses. Am I miscalculating that? How do others back up S3 without such high costs?