Guides
Engineering guides you can act on
Eight in-depth guides instead of a hundred thin ones. Each starts with the answer, shows the arithmetic, cites primary sources and links to the matching tool.
Backup and disaster recovery
RPO and RTO from NIST definitions, 3-2-1 and immutable copies, ransomware guidance from CISA, restore-time arithmetic and a restore-drill runbook.
11 min read · updated November 8, 2026Read the guide →
Choose a hosting type
A decision tree, signal table and cost-shape arithmetic for picking shared, VPS, cloud, bare metal or GPU hosting, plus migration paths between them.
12 min read · updated November 8, 2026Read the guide →Cloud migration
Inventory, dependency mapping, transfer-time arithmetic, DNS TTLs, database replication and a cutover runbook with rollback criteria.
13 min read · updated November 8, 2026Read the guide →
GPU memory for LLM inference
The arithmetic for weights, KV cache and overhead, worked for Llama 3.1 8B and 70B at three precisions, with cited GPU memory sizes and tensor parallelism.
11 min read · updated November 8, 2026Read the guide →
Hosting TCO
A 36-month total cost of ownership method with every cost line, a worked example on stated assumptions, and a sensitivity check.
10 min read · updated November 8, 2026Read the guide →
Linux hardening
Users, SSH keys, sshd_config, firewall, automatic updates, time, logs, services, permissions, secrets, backups and monitoring, with a verification checklist.
10 min read · updated November 8, 2026Read the guide →
Shared responsibility
The responsibility split for shared, VPS, managed, cloud, bare metal and GPU hosting, the gaps behind real incidents, and the questions to ask any provider.
9 min read · updated November 8, 2026Read the guide →
VPS sizing
How to measure CPU, memory, disk and network on Linux and turn the numbers into a VPS size, with worked examples for WooCommerce, an API and PostgreSQL.
13 min read · updated November 8, 2026Read the guide →Need a second opinion on your plan?
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