Can someone please help me understand how does dynamodb backup works, I read dynamodb documentation and want to understand the consistency guarantees that is offered with their native backup feature. And towards that I found the following in their docs :

1) DynamoDB backups do not guarantee causal consistency across items; however, the skew between updates in a backup is usually much less than a second.

2) You can create backups that are consistent within seconds across thousands of partitions without worrying about schedules or long-running backup processes.

Not sure, but the above 2 points look contradicting to me ? Can someone help me understand the backup consistency guarantees ?

Thanks in advance