--- title: How Does Real-time Replication Work for Amazon Elastic Compute Cloud (Amazon EC2)? description: More information on how Arpio handles real-time Amazon EC2 replication with AWS Elastic Disaster Recovery Service (DRS) --- [Skip to content](https://docs.arpio.io/real-time-ec2-replication-faq#main-content) English Show submenu for translations [Customer ticket portal](https://docs.arpio.io/tickets-view?hsLang=en) - Home - Products - Pricing - Blog - Company Open main navigation Close main navigation - Home - Products - Pricing - Blog - Company - English Show submenu for translations - [Customer ticket portal](https://docs.arpio.io/tickets-view) Welcome to Arpio Technical Docs - There are no suggestions because the search field is empty. 1. [Arpio Documentation](https://docs.arpio.io/?hsLang=en) 2. [FAQ](https://docs.arpio.io/faq?hsLang=en) 3. [AWS FAQ](https://docs.arpio.io/faq?hsLang=en#aws-faq) # How Does Real-time Replication Work for Amazon Elastic Compute Cloud (Amazon EC2)? ## More information on how Arpio handles real-time Amazon EC2 replication with AWS Elastic Disaster Recovery Service (DRS) To enable real time EC2 replication, Arpio relies on an integration with the AWS[DRS](https://docs.aws.amazon.com/general/latest/gr/drs.html).  This article will provide an overview of real-time Amazon EC2 replication in Arpio, as well as address some frequently asked questions. For documentation on how to enable real-time replication for EC2 in Arpio, [click here](https://docs.arpio.io/real-time-replication?hsLang=en). #### **Understanding your real-time recovery-point objective (RPO)** Your recovery point objective is defined by the maximum gap of time your business application can afford to be down before service is restored. When real-time replication is selected for a resource, your RPO will be reduced to seconds. [See](https://docs.arpio.io/recovery-point-objective?hsLang=en) Arpio’s documentation for more details about your application’s RPO in Arpio.  #### **Replication lag** While unlikely, real-time[replication lag](https://docs.aws.amazon.com/drs/latest/userguide/What-Lag-Backlog-Mean.html.) can occur in specific scenarios, and your RPO can increase beyond seconds. These[environmental factors](https://docs.aws.amazon.com/drs/latest/userguide/failback-overview.html) are out of Arpio's control and will likely correct themselves.  #### **Snapshot policy for resources with real-time RPOs** AWS DRS maintains an aggressive[point in time (PIT) policy](https://docs.aws.amazon.com/drs/latest/userguide/point-in-time.html) for snapshots, which is automatically set by AWS DRS. Those policies' defaults are: - Every 10 minutes for the last hour - Once an hour for the last 24 hours - Once a day for the last 7 days\* \*Arpio will calculate this retention policy based on your Arpio application Recovery Point Retention and there is no further action needed.  #### **Replication vs. Snapshots** There will likely be servers in your source environment that are not critical to recovering instantly if a disaster strikes. You still need them in your recovery environment. Arpio recognizes this and will apply the lowest RPO available via low-cost Amazon EBS snapshots on these servers that do not have the AWS Replication agent installed. More details about how this set up works can be found in our documentation[Enabling Real-time Replication for Amazon EC2.](https://docs.arpio.io/real-time-replication?hsLang=en) #### **Cloud costs associated when using Arpio with the AWS DRS service** Arpio uses integration with AWS’s Elastic Disaster Recovery service to achieve real-time replication. This will introduce additional costs to your AWS bill that include the agent, replication servers, and snapshots. Please review[Amazon pricing for DRS with examples](https://aws.amazon.com/disaster-recovery/pricing/) **Note**: Costs associated with cross-region replication are not detailed in the Amazon pricing for DRS. These cross-Region data transfer costs are outlined[here](https://aws.amazon.com/blogs/architecture/overview-of-data-transfer-costs-for-common-architectures/). 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