ChronoVault — Streaming Incremental Backup for Fabric

Real-time chunk-level backup with SHA-256 dedup, Zstd compression, web panel, and cloud sync. Only stores what changed — no more wasteful full-world dumps.

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Why ChronoVault?

Traditional backup mods dump the entire world on a timer — slow, wasteful, and disruptive. ChronoVault captures chunks as they are saved via Mixin injection, computes a SHA-256 hash, and only stores what actually changed. This is backup built for production servers.

Feature	ChronoVault	Vanilla Backup	Fast Backups
Incremental (changed chunks only)	✅	❌	❌
SHA-256 dedup (no duplicates)	✅	❌	❌
Hot restore (no restart)	✅	❌	❌
Chunk-level rollback	✅	❌	❌
Web dashboard	✅	❌	❌
Cloud sync (S3/WebDAV)	✅	❌	❌
Player evacuation on restore	✅	❌	❌
Live audit (who broke/placed what)	✅	❌	❌
Section-level audit diff	✅	❌	❌
Zstd compression (~6.4:1 ratio)	✅	❌	❌
SQLite metadata (instant queries)	✅	❌	❌
Notification webhooks	✅	❌	❌
Config hot-reload	✅	❌	❌

Features

Streaming Incremental Backup

ChronoVault hooks into Minecraft's chunk serialization pipeline via Mixin. Every time a chunk is saved, we capture it in real-time, hash it, and store it only if it's new. No polling, no wasted I/O.

Hot Restore with Player Evacuation

Roll back any region without restarting the server. Players in affected chunks are safely evacuated to spawn before the restore begins. Down to the minute — no world downtime.

Live Audit Tracking

Real-time block break, block place, and explosion event logging via Mixin injection. Query by player name in-game (/cv audit <player>) or via Web API. Every block change is timestamped and attributable.

Section-Level Audit Diff

Compare two snapshots at chunk-section granularity (16×16×16) using NBT hash comparison. Cross-reference with live audit logs for full player attribution on every change.

Web Dashboard (port 27480)

Built-in single-page web app for monitoring and management:

• Status — engine health, queue size, dropped chunks, player count
• Snapshots — browse, inspect, trigger manual backup
• Restore — cold or hot region restore via coordinate inputs
• Live Audit — query real-time block events by player
• Audit Diff — section-level comparison between any two snapshots
• Config — hot-reload all settings without restart

Cloud Sync

Auto-upload snapshots to S3 or WebDAV. Async worker pool never blocks the server tick. Tiered retention keeps recent snapshots local, archives older ones to cloud.

Layered Retention

Configurable retention policy: keep all snapshots for N hours, then hourly for M days, then daily for K days. Old snapshots auto-rotate with optional cloud offload.

Notification Webhooks

Discord, Slack, and Feishu webhook integration. Get notified on backup completion, restore events, and errors.

Configuration Hot-Reload

Change any setting in config/chronovault.json while the server is running. No restart needed.

Installation

1. Download from Modrinth
2. Place it in your server's mods/ folder
3. Requires Fabric Loader ≥ 0.16.0 and Fabric API ≥ 0.100.0
4. Start the server — ChronoVault auto-configures and begins capturing on first chunk save
5. Open http://your-server:27480 for the web dashboard

Configuration: all settings in config/chronovault.json.

Commands

All commands use /cv prefix. Run them from server console or as an OP.

Command	Description
/cv backup	Force a new snapshot immediately
/cv list	List all snapshots with time, chunks, size
/cv snapshots	Alias for /cv list
/cv status	Show engine status (queue, dropped, online)
/cv delete <id>	Delete a snapshot permanently
/cv restore <id> [x1 z1 x2 z2]	Cold-restore a region (restart required)
/cv hot-restore <id> <x1> <z1> <x2> <z2>	Hot-restore a region (no restart, players evacuated)
/cv audit [player] [limit]	Query live audit events by player
/cv config [key] [value]	View or set config (hot-reloads)
/cv schedule [now]	Show schedule or trigger scheduled backup
/cv reset	Reset dropped chunk counter

License

MIT.

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Built for server admins who take their worlds seriously.