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Notes on AWS, the parts nobody documents.

By Wellar Team.

Editorial miniature showing a row of healthy backup modules connected by one amber test bridge to a running application module.
12 min read

AWS Backup Restore Testing: A Backup Is Not a Recovery Plan

Use AWS Backup restore testing to schedule real recoveries, validate restored RDS and EBS resources, measure RTO, and catch failures before an incident.

aws-backupdisaster-recoveryreliability
Editorial illustration of one cyan data stream crossing between two dark infrastructure zones, with an amber meter on each side of the boundary.

AWS Cross-AZ Data Transfer: Why One GB Shows Up Twice

Trace AWS cross-AZ data transfer cost from the billing line to the ENI path, explain the two-sided charge, and separate resilience from avoidable waste.

11 min read
Editorial diagram of a thick stream of log events entering a small storage reservoir, titled CloudWatch Logs cost, retention is not the first fix.

CloudWatch Logs Cost: Retention Is the Wrong First Fix

A practical CloudWatch Logs cost audit: separate ingestion from storage, find the noisiest log groups, and cut spend without deleting useful evidence.

12 min read
A dark home-office desk at night lit by laptop glow and a small lamp, with a phone on the desk showing a notification at 22:14 on a Sunday.

AWS bill too high? The 8 questions to ask before touching the console.

A senior engineer's triage order for an AWS bill that just spiked. Eight questions, ranked by dollars-per-minute. Most teams should stop at question five.

19 min read
Calculator-style graphic comparing a 500 GiB gp2 EBS volume at $50 per month with gp3 baseline at $40 and gp3 matched throughput at $45.

AWS gp2 to gp3: the 20% savings claim has a footnote

An AWS EBS gp2 vs gp3 migration guide with cost math, CloudWatch checks, and the gotcha that shrinks a 20% win to 8-10%.

11 min read
Side-by-side mock of an AWS Trusted Advisor check showing zero idle NAT Gateways alongside a single NAT Gateway tile labeled $48.32 over 41 days

Trusted Advisor is wrong about your NAT Gateways. Here's the math.

AWS's new Trusted Advisor check still misses a category of idle NAT Gateways that costs $32+/month each. Here's the math, the metric, and the CLI.

11 min read

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