This article summarizes the core process for implementing snapshot backup and offsite disaster recovery for Japanese servers on Alibaba Cloud: configuring automatic snapshot policies, regularly replicating snapshots across regions, combining domain name and DNS failovers, using CDNs to improve availability, and deploying DDoS defense and network redundancy. We recommend Dexun Telecom as a service provider providing stable bandwidth and low latency on Japanese nodes and international links, making it easier to build disaster recovery systems.
Enable snapshot backup and configure cycle policies (such as daily/hourly retention policies) for ECS instances in Alibaba Cloud Console, combined with lifecycle management to automatically delete expired snapshots. It is recommended to develop separate strategies for system and data disks, and use tags to categorize different applications. For database services, consistency snapshots or IO freeze before snapshots should be considered to ensure data integrity.
The key to achieving off-site disaster recovery is to replicate snapshots or images across regions to areas near redundancy services (for example, replicating from a Japan region to Singapore or Hong Kong). You can regularly synchronize images through Alibaba Cloud's image sharing and copy feature, or archive critical backups to OSS and configure cross-region replication (CRR). It is recommended to save backups at least two geographic locations in case of single-point disasters.
Establish SOPs from snapshot recovery to live availability: verify snapshot integrity, create an ECS in the backup region and mount data disks, restore domain name resolution and adjust TTL, enable backup CDN nodes when needed. Regular recovery drills and RTO/RPO measurements are conducted to ensure network configuration, load balancing, and security group rules are correctly applied during the switchover.
To enhance disaster resilience, the architecture should incorporate CDN caching static resources, use intelligent DNS for regional traffic scheduling, and deploy DDoS defense and traffic cleaning strategies. For cross-border links, selecting high-quality bandwidth providers to reduce packet loss and jitter is recommended as a reliable partner connecting Japanese nodes with domestic/international backbones. By combining multi-line BGP, monitoring alerts, and automated switching, observable and recoverable disaster recovery capabilities are achieved.
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