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lightbulbDid you know?Database9 Nov 2026

A company spends 100K a month on cloud, replaced RDS with Mongo on EC2, is it the right decision?

Probably not, at least not as a first move. The cloud bill went down, but some of the cost likely just moved somewhere else.
Hidden costs
  • Backups, failover, replica sets, patching, upgrades and monitoring are now your team’s job. One engineer’s time can easily cost more than what was saved.
  • Moving a relational schema to MongoDB means rewriting queries, joins and transactions. That’s a migration risk, not just an infra change.
  • Is MongoDB running as a 3-node replica set with tested restores? A single EC2 instance is a data-loss risk.
Cheaper fixes for RDS were available
  • Reserved Instances or Savings Plans (~36% off).
  • Right-sizing and moving to Graviton (m6g/m7g).
  • gp3 storage, checking IOPS, trimming snapshot retention.
  • Turning off Multi-AZ or downsizing in non-prod.
  • Archiving old data.
These usually save 30–50% with no code changes. When it’s fine: the workload was really document-shaped, the team already runs MongoDB well, and HA and backups are set up properly.
All tips
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