Security, Backups, and Reliability
Why This Matters
A Raspberry Pi often starts as a toy and slowly becomes infrastructure.
Once that happens, weak passwords, no backups, and mystery config become expensive.
Security Basics
| Practice | Why it matters |
|---|---|
| Unique credentials per device | Limits blast radius |
| SSH keys over password habit | Better security and convenience |
| Regular updates | Fixes known vulnerabilities |
| Minimal exposed ports | Smaller attack surface |
| Separate untrusted devices and workloads | Protects the rest of your network |
Hardening Checklist
- change default-style assumptions immediately
- disable services you do not use
- keep SSH but tighten it
- avoid exposing admin UIs to the public internet
- prefer VPN access over router port forwarding
- store secrets outside source code
- back up config and data before major upgrades
Reliability Patterns
Assume Reboots and Power Cuts Will Happen
Build so recovery is boring.
That means:
- services auto-start
- important data is persisted outside temporary paths
- logs are inspectable
- storage is decent quality
- there is a documented restore path
Backups You Actually Need
| Asset | Backup method |
|---|---|
| Source code | Git remote |
| Environment and config | encrypted backup or password manager + config repo |
| Databases | scheduled dumps |
| Media worth keeping | copy to NAS or external storage |
| Full device rebuild notes | simple markdown or text notebook |
Monitoring Without Overcomplicating It
At minimum, know:
- CPU temperature
- free disk space
- memory pressure
- whether your main service is up
- last successful backup time
A simple health endpoint plus a scheduled external check is enough for many home projects.
Signs Your Build Is Becoming “Real”
- other people depend on it
- it stores data you would hate to lose
- it controls something physical
- it runs when you are asleep or away
- you have more than one environment or device
When those appear, treat it like real infrastructure.
Recovery Drill
Practice this once:
- imagine the SD card dies tonight
- provision a fresh image
- restore config and code
- reconnect storage or peripherals
- verify the main service starts cleanly
If that process is painful, improve your documentation and automation now.
Good Next Habits
- set calendar reminders for upgrades
- keep one known-good spare SD card or image
- export important service configs to version control
- label cables and power supplies
- document wiring for every physical build
Next Step
Finish with 10-project-ideas-and-build-roadmaps.md and pick one build path to execute instead of collecting ideas forever.