CaCl2Backup
CaCl2Backup is a free, MIT-licensed backup mod for Minecraft Java servers using Fabric.
What CaCl2Backup is
CaCl2Backup is a free, MIT-licensed backup mod for Minecraft Java servers using Fabric. It can trigger backups at intervals, on a daily schedule, or when the server stops, and those triggers can be combined. The mod writes backup data to temporary output, verifies it with CRC checks, then publishes it atomically after validation. Automatic cleanup can be set by maximum backup count and maximum age. Operators use /backup commands to create, list, restore, or delete backups; all commands require OP privileges. Restore replaces the current world save. The project describes safeguards including level.dat validation, rollback handling, and path-traversal protections. Configuration can be reloaded without restarting the server. Installation involves putting the mod JAR in the server's mods folder after installing Fabric Loader and Fabric API. Requirements are Minecraft 26.0+ in the 26.x series, Fabric Loader 0.15.0+, Fabric API, and Java 25+. The documented storage destination is local, and restore granularity is a full backup.
Good
- Supports interval, daily, and server-stop triggers.
- Retention can limit count and age.
- Verifies backup data before atomic publication.
- Configuration reloads without a server restart.
- Free and MIT-licensed.
Watch out
- Requires Minecraft 26.0+ in the 26.x series.
- Requires Java 25+ and Fabric components.
- Restore replaces the current world save.
- Commands require operator privileges.
Who it suits
It suits operators of supported Fabric Minecraft Java servers who want scheduled or event-triggered local world backups. Users should be comfortable with OP-only commands and full-world restore behavior.
Verdict
CaCl2Backup offers configurable local backups and retention for servers that meet its specific Fabric and Minecraft requirements. Note that restore replaces the current world save and is available only through OP-protected commands.
Plans and prices
From CaCl2Backup's own pricing page, checked 4 Oct 2026.
| Plan | Price | What it gives you |
|---|---|---|
| Free | Free | MIT-licensed Fabric server mod · requires Minecraft 26.0+, Fabric Loader 0.15.0+, Fabric API, and Java 25+ |
The facts
Each one read from CaCl2Backup's own pages, with the date it was checked.
What it does
- Access control
- All /backup commands require operator privileges.checked 4 Oct 2026
- Backup integrity
- Backups use temporary output, full CRC verification, and atomic publication.checked 3 Oct 2026
- Backup triggers
- It supports interval, daily schedule, server-stop, and manual backup triggers that can be combined.checked 4 Oct 2026
- Compatibility
- The stated requirements are Minecraft 26.0+ in the 26.x series, Fabric Loader 0.15.0+, Fabric API, and Java 25+.checked 4 Oct 2026
- Compatibility limit
- The README specifies Minecraft 26.0+ in the 26.x series.checked 3 Oct 2026
- Compression integrity
- The mod writes backups to temporary output, verifies CRC, and publishes them atomically after validation.checked 4 Oct 2026
- Configuration
- The mod stores configuration at config/cacl2backup.json and supports reloading it without restarting the server.checked 4 Oct 2026
- Installation
- Installation instructions say to put the mod JAR in the server's mods folder after installing Fabric Loader and Fabric API.checked 4 Oct 2026
- Integrations
- The README documents Fabric and Minecraft requirements and does not name any external backup storage integrations.checked 4 Oct 2026
- License
- The project lists the MIT license.checked 4 Oct 2026
- Management
- Operators can create, list, restore, and delete backups with /backup commands; commands require OP privileges.checked 3 Oct 2026
- Purpose
- CaCl2Backup is a Minecraft server backup mod designed for Fabric.checked 4 Oct 2026
- Requirements
- The README lists Minecraft 26.0+, Fabric Loader 0.15.0+, Fabric API, and Java 25+ as requirements.checked 3 Oct 2026
- Restore
- It restores world saves from backups, and restore operations overwrite the current world save.checked 4 Oct 2026
- Restore recovery
- The changelog describes level.dat validation, preserved rollback worlds, automatic swap rollback, and recovery on the next start after failed startup.checked 4 Oct 2026
- Restore safeguards
- The changelog describes validating level.dat before restore and rollback handling for failed swaps.checked 3 Oct 2026
- Retention
- Automatic cleanup can apply both a maximum backup count and maximum backup age; the documented defaults are 10 backups and 7 days.checked 4 Oct 2026
- Security
- The project changelog says it added Zip Slip path-traversal protection and backup-name path filtering.checked 3 Oct 2026
- Security fixes
- The changelog reports fixes for Zip Slip path traversal, backup-name path filtering, and a TOCTOU race condition.checked 4 Oct 2026
- Support
- The repository page lists zero open issues when viewed.checked 4 Oct 2026
- What it does
- CaCl2Backup is a Minecraft server backup mod designed for Fabric.checked 3 Oct 2026
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