Does enabling PITR impact the performance or availability of a DynamoDB table?

No, PITR can back up tables with hundreds of terabytes of data with no impact on the performance or availability of the DynamoDB table data.

How long can DynamoDB keep backup data using PITR?

Maximum Thirty Five Days.

Does Amazon Aurora encrypt your data in transit and at rest?

Is it possible to use Amazon Aurora in Amazon Virtual Private Cloud(VPC)?

How many secondary regions can an Amazon Aurora Global Database have?