CloudPlanetScaleabout 17 hours ago
Massively parallel Postgres backups
11 min read
PlanetScale backs up sharded Postgres databases by spinning up one EC2 instance per shard, restoring prior S3 snapshots, and replaying WAL in parallel. The approach sustains over 50 GB/s, backing up petabyte-scale databases in hours. A 32 TB database on 8 shards backs up in about 2.8 hours.
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