S3 Backup Mod
by emurphy04
S3 Backup Mod automatically zips a Java Edition server world and uploads it to an Amazon S3 bucket on a schedule, and the server owner can also start a backup by hand.
What it does
A server owner configures the mod in game through a setup wizard that asks for the AWS region, bucket, key prefix, credentials and retention. Once set, the mod backs up the world on a timer, with a default interval of 10 minutes. The /backupnow command starts an extra backup at any moment, and commands run with admin permissions.
Retention is handled by pruning: only the newest N backups stay in the bucket, with 5 as the default. Saving the world happens on the main server thread, while zipping and uploading run on a background thread so the server keeps ticking. A non-secret configuration file is generated as well. The mod needs an AWS account with access to the target bucket, and the IAM permissions are described on the project's public page. Fabric API is required.
S3 Backup Mod is published for Fabric only, for Minecraft 1.21.8, and the latest file is version 1.1.0 from 2025-09-05. Server owners install it, and players connect with no copy of their own. The code is open source under the MIT License.
Key features
Scheduled world backups
The world is zipped and uploaded to S3 at a set interval, 10 minutes by default, without any manual step.
Manual backup command
The backupnow command triggers a backup immediately, outside the schedule.
In-game setup wizard
Region, bucket, prefix, credentials and retention are entered in game, so no file needs editing first.
Retention pruning
Only the latest N backups are kept in the bucket, with N set to 5 by default.
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
Use cases
Protecting a shared survival world
A server with many players can keep off-site copies of its world in case a save is damaged or lost.
Frequent restore points
A short default interval gives the server owner recent points to restore from after a bad change.
Who it’s for: Server owners running Minecraft 1.21.8 with Fabric who already hold an AWS account and an S3 bucket. Players do not need the mod.
How it compares
Easy backups is server-side only, released under the Apache License 2.0, and published for Fabric 1.21.10. Tempus is also server-side only, with Fabric files for 1.21.4 under the Apache License 2.0 and open source. Backup Always Right is server-side only, open source under the MIT License, and covers Fabric files for 1.21.1 – 26.2, a wider range than this mod's single version.
| Mod | Loaders | Game versions | Environment | Updated |
|---|---|---|---|---|
| S3 Backup Mod | Fabric | 1.21.8 | Server-side only | 2025-09-05 |
| Easy backups | Fabric | 1.21.10 | Server-side only | 2025-12-28 |
| Tempus | Fabric | 1.21.4 | Server-side only | 2025-02-01 |
| Backup Always Right | Fabric | 1.21.1 – 26.2 | Server-side only | 2026-07-26 |
Questions
Does S3 Backup Mod need Fabric API?
Does every player need to install S3 Backup Mod?
Which Minecraft versions does S3 Backup Mod support?
In the catalog
S3 Backup Mod is one of 4,058 Storage mods on ModsFinder, and one of 2,474 Storage mods for Fabric. 17,695 mods support Minecraft 1.21.8.
More from emurphy04
Similar mods
What the author says
Back up your Minecraft server world to Amazon S3 on a schedule — with an in-game setup wizard, a manual /backupnow command, and automatic pruning to keep only the newest N backups.
Official listing
- Modrinth page
- modrinth.com/mod/s3-backup-mod
- Owner
- emurphy04
- Published
- 2025-08-26
- Updated on Modrinth
- 2025-09-05
- Facts verified
- 2026-10-15