BtrBack vs FastBack

BtrBack is a Minecraft Java server plugin for making and restoring full-server backups with Btrfs snapshots. It stores backups locally, supports scheduled backups, and uses a custom retention policy. Operators install the plugin in the server’s plugins folder and use `/btrback [backup/rollback]` to create a backup or start a rollback. Normal backups appear in the `backupSnapshots` section of `backups.json`. Before a rollback, the plugin also snapshots the current server state and records it under `rollbackSnapshots`, outside the regular backup list. Restoring a backup reboots the server twice: once to restore the saved state and again to start normally. Setup requires placing the server directory in a Btrfs subvolume and mounting the root subvolume with `user_subvol_rm_allowed`. The public repository includes the Good Luck With That Public License, which permits copying, distribution, modification, merging, selling, publishing, and sublicensing at the user’s own risk. The repository page shows no releases and zero open issues. The listed plan is free at free.

FastBack is a free Minecraft mod for making incremental snapshots of Java worlds: each snapshot records only the parts that have changed. It can save backups locally, send them to another Git repository, or write them to a network drive without a Git server. Automatic backups can run when a world shuts down or after Minecraft autosaves, with a configurable minimum wait between runs. A snapshot can be restored as a separate world copy, so the current world files remain unchanged. Retention options include daily, fixed-count, GFS, and all-snapshots policies; snapshots can also include mod jars and configuration files. FastBack works on Minecraft clients and dedicated servers, with Linux, Mac, and Windows support. Separate Fabric and NeoForge mod files are listed. It requires native Git and Git LFS to be installed and available on the Minecraft process PATH. Garbage collection can take more than five minutes, and the documentation recommends running git gc directly for worlds larger than 1 GB. The mod is distributed under GNU Public License version 2; modpack use requires attribution with a link to the project page.