Disaster Backup

The problem. Disaster preparedness is critical in Japan, especially in the Greater Kanto region. However, vital emergency guides, checklists, and evacuation maps are typically scattered across different websites, government portals, or PDFs. If a major earthquake takes down the cellular network and power grid, relying on online resources or cloud-dependent notes becomes a single point of failure when you need them most.

Why I built it. I wanted a highly localized, demographic-specific, and 100% offline emergency reference for my household. Standard disaster checklists offer generic advice, but they don’t calculate the specific needs of a family that includes young children and aging seniors. I needed a verified system that my family could access immediately on any device, with or without an active internet connection.

What it does. It is an offline-first disaster preparedness library containing structured Markdown manuals and verified PDFs. It covers home shelter (Zaitaku Hinan) protocols, first aid, earthquake responses, and static evacuation maps for the local area. The library is synced across family devices via iCloud Drive and has a redundant local copy on a Synology NAS, allowing local network (LAN) access even if the home’s external internet connection is completely severed.

The benefits. The library removes guesswork during a crisis. It calculates precise resource targets—such as a 63-liter water reserve tailored to our specific household size and maps out exact NTT 171 disaster voice message board and J-Alert procedures verified against primary sources. By ensuring the data sits on local hardware and storage, emergency procedures remain immediately actionable during a blackout.

Features

• Household shelter-at-home protocol mapping local emergency infrastructure and utility shutdowns
• Multi-generational 72-hour and 7-day physical kit inventory calculating food, water, and specialized care guidelines
• Offline-first architecture synced via iCloud Drive and backed up to a local Synology NAS for LAN accessibility
• Region-specific emergency resources tailored for the Kanagawa-ku and Greater Kanto area
• Scheduled maintenance cycles using launchd to audit emergency contacts, local shelter locations, and NTT disaster lines annually