Fast Async Backups
Fast Async Backups lets server owners and operators create compressed zip copies of a whole world folder with a single command while the server keeps running.
What it does
Each backup copies the world into a temporary directory first, so file locks held by other mods such as Sable do not interfere, and then compresses that clean copy into a zip file in a backup folder beside the world folders. Failed copies are retried up to five times with increasing backoff. Backups run on a separate thread, which keeps the server responsive during the work, and players see progress and completion messages broadcast server-wide.
Old archives are removed automatically once the number of stored backups passes a limit. That limit is set with a command or in a JSON config file at backup/backup_config.json inside the server directory, which is created on first use. Names are validated to block path traversal. The mod is built to work alongside Sable, Aeronautics and C2ME-related content, and it requires no configuration to get started. Players need operator permissions to run its commands.
Key features
Instant zip backups
A single command produces a compressed zip of the full world folder, named by a fixed format.
Non-blocking copies
Backups run asynchronously, so the server does not freeze while an archive is being written.
Automatic rotation
Older backups are pruned once the configured limit is exceeded, so the disk does not fill up.
Adjustable limit
The backup limit can be changed in-game with a command or edited directly in the JSON config file.
Compatibility
Latest build for each game version and loader.
1.21.x11 of 11 versions with builds
Only full game releases are shown. This mod publishes no snapshot builds.
Use cases
Recovering from corruption
A world damaged by a faulty mod, a power outage or a bad edit with WorldEdit can be rolled back to a recent archive.
Safe testing
A backup taken before installing or changing mods gives a known copy to return to.
Who it’s for: The mod suits server owners and operators who want regular world archives without stopping the server or setting up external tools.
How it compares
Chrono Vault is a NeoForge mod for 1.21.1, released under the GNU General Public License v3.0 or later, and it is open source. Its server runs it, and players may add it, so it works on either side while only the server needs it. Universal Save Backup is a NeoForge mod for 1.21.1 under the MIT License, and it is not open source. Fast Async Backups is a server-side mod for 1.21.1 – 1.21.11 under the MIT License, so only the server needs it and players join without installing anything.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| Fast Async Backups | NeoForge | 1.21.1 – 1.21.11 | Server-side only | 2026-06-04 |
| Chrono Vault | NeoForge | 1.21.1 | Server required, client optional | 2026-04-07 |
| Universal Save Backup | NeoForge | 1.21.1 | Client and server | 2026-08-24 |
Questions
Does Fast Async Backups need to be installed on clients?
Where are the backups stored?
Which game versions does the NeoForge file support?
In the catalog
Fast Async Backups is one of 8,016 Management mods on ModsFinder, and one of 2,689 Management mods for NeoForge. 19,862 mods support Minecraft 1.21.11.
Similar mods
What the author says
Simple, reliable world backups at the press of a key — or the tip of a command. Ever had your world corrupted by a rogue mod, a power outage, or just a bad decision with WorldEdit? World Backup lets you create instant, compressed zip backups of your entire world folder with a single command. Backups run…
Official listing
- Modrinth page
- modrinth.com/mod/fastasyncbackups
- Owner
- abhinavkumarmauryax
- Published
- 2026-06-03
- Updated on Modrinth
- 2026-06-04
- Facts verified
- 2026-10-15