CaCl2Backup
by RealCaCl2
CaCl2Backup is a server-side Fabric mod that backs up the world save on a schedule, on shutdown or on demand, and can restore a saved world.
What it does
Three independent triggers can be combined freely: an interval timer, a daily schedule and a server stop. Each backup is written as a zip file, and the mod can run parallel compression on several threads, which the author describes as a significant speed-up for large worlds. After a backup finishes, old archives are removed automatically once they pass a configured count or age limit.
Operators use commands with the backup prefix to create a backup with an optional label, list existing backups, view the current status and configuration, and restore a full world save. Each entry in the backup list has an index number that can be used in place of the full filename. Labels accept letters, digits, underscores and hyphens, and any other character is replaced with an underscore. The configuration can be reloaded without restarting the server, and the restore command overwrites the current world save, so a manual backup beforehand is recommended.
Installation requires Fabric API. Only the server needs it, and players join without installing anything. Files are published for Fabric only, for 26.1, 26.1.1, 26.1.2 and 26.2, with 1.2.0 for 26.2 as the latest file, and the code is released under the MIT License as open source.
Key features
Scheduled and shutdown backups
Backups run on an interval, at a daily time, or when the server stops, and the three triggers can be used together.
Multi-threaded compression
Parallel compression across several threads shortens the time a backup takes on large worlds.
Automatic cleanup
Old backups are deleted after each run according to a maximum count and a maximum age.
Labelled backups
A backup can be given a label, with unsupported characters replaced by underscores so the filename stays valid.
Index-based selection
Backups can be restored or inspected by their list index number instead of typing the full filename.
Hot-reloadable configuration
Configuration changes take effect through a reload command, without a server restart.
Compatibility
Latest build for each game version and loader.
Only full game releases are shown. This mod publishes no snapshot builds.
Requirements
Dependencies declared by the latest file for each loader.
Required 1
How it compares
Simple Server Backups is also server-side only and open source under the MIT License, but it covers 26.1.2 – 26.3. Backup Always Right is server-side only, open source under the MIT License, and covers 1.21.1 – 26.2. World Backup is client-side only, so it runs in a player's game rather than on the server.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| CaCl2Backup | Fabric | 26.1 – 26.2 | Server-side only | 2026-08-06 |
| Simple Server Backups | Fabric | 26.1.2 – 26.3 | Server-side only | 2026-09-16 |
| Backup Always Right | Fabric | 1.21.1 – 26.2 | Server-side only | 2026-07-26 |
| World Backup | Fabric | 26.1 – 26.2 | Client-side only | 2026-07-22 |
Questions
Does CaCl2Backup need Fabric API?
Does every player need to install CaCl2Backup?
Can a backup be restored by its list number?
In the catalog
CaCl2Backup is one of 4,058 Storage mods on ModsFinder, and one of 2,474 Storage mods for Fabric. 13,894 mods support Minecraft 26.2.
Similar mods
What the author says
A comprehensive Minecraft server backup mod designed for Fabric. All commands require OP privileges and use the /backup prefix.
Official listing
- Modrinth page
- modrinth.com/mod/cacl2backup
- Owner
- RealCaCl2
- Published
- 2026-04-28
- Updated on Modrinth
- 2026-08-06
- Facts verified
- 2026-10-15