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A reliable Linux backup uses a Bash script that coordinates with the Minecraft console, writes a timestamped archive to storage outside the live world directory, removes old generations, and records failures. Run that script hourly with either cron or a systemd timer, and verify it by restoring an archive into a separate test directory.
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For an online backup, pause automatic saves with save-off, flush data with save-all (and save-all flush on Minecraft 1.16 and newer), archive every world directory, then resume saving in a cleanup trap. The nicolaschan/minecraft-backup documentation recommends RCON when possible because it can acknowledge that saving has finished.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesWhat the backup must protect
A Minecraft server is more than the main world directory. A typical Java server also has world_nether and world_the_end, plus player data, advancements, statistics, the whitelist, operator lists, and server configuration. Back up the complete server state you need to recreate the instance, but do not copy the live directory into the backup destination while it is being modified.
The nicolaschan/minecraft-backup project is a useful reference implementation: it accepts world-folder inputs, can produce tar archives or a restic repository, and supports RCON, screen, tmux, Docker, and cron. Its restore model is deliberately simple: extract a known-good archive into a new directory, inspect it, and only then replace the production world.
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Online backup or maintenance window?
Why save coordination matters
Copying files while the server is writing them can produce a set made from different moments in time. The safest procedure is to stop the server cleanly and copy the files while no process can change them. That requires a short maintenance window, but it gives the most consistent snapshot.
If the server must remain online, coordinate the save cycle:
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- Send
save-offto pause automatic world saves. - Send
save-allto flush world and player data. - On Minecraft 1.16 and newer, send
save-all flushto force writes to disk. The reference script documents this command as harmless on older versions, so it can be enabled for mixed-version fleets. - Wait for completion. RCON can provide an acknowledgement; screen and tmux generally require a delay tuned to the size and speed of the world.
- Create the tar or restic backup from each world directory.
- Send
save-onin a cleanup trap so autosaving resumes even if archiving or retention fails.
Online coordination reduces the risk but does not eliminate it. The project documentation warns that player-event saves can continue after save-off, leaving player data and world data with a timing mismatch. Treat an online archive as a risk-managed snapshot, disclose that limitation to your players, and test restores. For irreplaceable worlds, stop the server cleanly before copying.
A Bash script that creates timestamped archives
Save the following as /usr/local/sbin/minecraft-backup and make it executable with sudo chmod 750 /usr/local/sbin/minecraft-backup. The script assumes the service account can read the server directory and write the backup destination. Set the RCON command for your client; the array shown uses the commonly available mcrcon syntax, but the same function can call another RCON client.
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#!/usr/bin/env bash
set -Eeuo pipefail
SERVER_DIR=/srv/minecraft
BACKUP_ROOT=/srv/minecraft-backups
KEEP=24
FLUSH=true
WORLDS=(world world_nether world_the_end)
STAMP=$(date -u +%Y-%m-%dT%H-%M-%SZ)
ARCHIVE=$BACKUP_ROOT/minecraft-$STAMP.tar.gz
RCON_PASSWORD=${RCON_PASSWORD:?Set RCON_PASSWORD in the service environment}
RCON=(/usr/bin/mcrcon -H 127.0.0.1 -P 25575)
mkdir -p $BACKUP_ROOT
mc() {
"${RCON[@]}" -p $RCON_PASSWORD "$1"
}
cleanup() {
if ! mc 'save-on'; then
logger -t minecraft-backup 'could not re-enable automatic saving'
fi
}
trap cleanup EXIT
mc 'save-off'
mc 'save-all'
if $FLUSH; then
mc 'save-all flush'
fi
# Add a delay when your console transport does not acknowledge completion.
sleep 5
tar -C $SERVER_DIR -czf $ARCHIVE ${WORLDS[@]}
mapfile -t archives < <(find $BACKUP_ROOT -maxdepth 1 -type f -name 'minecraft-*.tar.gz' -printf '%T@ %pn' | sort -nr | cut -d' ' -f2-)
if (( ${#archives[@]} > KEEP )); then
for old in "${archives[@]:KEEP}"; do
rm -f -- $old
done
fi
logger -t minecraft-backup "created $ARCHIVE"Store the RCON password outside the script, for example in a root-readable environment file used by the service, and restrict that file to the Minecraft administrator. Replace the world list if your server uses a different level-name or additional dimensions. The archive command records paths relative to SERVER_DIR, so extraction recreates the expected directory names.
What each part does
- Timestamp: UTC names sort predictably and avoid collisions between runs.
- Cleanup trap:
save-onruns when the script exits normally or after a failed archive, preventing a forgottensave-offfrom disabling autosaves indefinitely. - Retention:
KEEP=24retains the newest 24 tar files. Change it to match your disk capacity and recovery-point needs. - Exit status and logs:
set -Eeuo pipefailmakes command failures visible, whileloggersends success and cleanup errors to the system journal.
If you prefer deduplicated, encrypted repository storage, adapt the archive step for restic instead of tar. The reference project supports both output styles; tar remains convenient for a transparent, one-file restore.
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An hourly backup is a practical starting point for an active server. In /etc/crontab or a file under /etc/cron.d, use the account field explicitly:
0 * * * * minecraft flock -n /run/minecraft-backup.lock /usr/local/sbin/minecraft-backup >>/var/log/minecraft-backup.log 2>&1The flock guard prevents a second run from starting while a large archive is still being written. Use absolute paths because cron supplies a minimal environment. If the script reads RCON_PASSWORD from a file, have the cron command load that file before invoking the script, or use a wrapper owned by the Minecraft administrator.
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Schedule it with a systemd timer
Systemd timers make dependencies, logs, and per-server instances easier to inspect. Create /etc/systemd/system/minecraft-backup.service:
[Unit]
Description=Minecraft server backup
After=minecraft.service
[Service]
Type=oneshot
User=minecraft
Group=minecraft
ExecStart=/usr/local/sbin/minecraft-backupThen create /etc/systemd/system/minecraft-backup.timer:
[Unit]
Description=Hourly Minecraft backup
[Timer]
OnCalendar=hourly
Persistent=true
Unit=minecraft-backup.service
[Install]
WantedBy=timers.target
Enable and inspect it with:
sudo systemctl daemon-reload
sudo systemctl enable --now minecraft-backup.timer
systemctl list-timers minecraft-backup.timer
journalctl -u minecraft-backup.servicePersistent=true causes a missed calendar run to be started after the machine returns, rather than silently losing that interval. MCscripts provides Java and Bedrock backup services and timers, and ArchWiki references minecraftd-backup.timer; these are useful patterns when you manage several servers. Choose one scheduler per server, not both.
Cron versus a systemd timer
| Consideration | Cron | Systemd timer |
|---|---|---|
| Scheduling visibility | Inspect the crontab and command output | systemctl list-timers shows the next and previous run |
| Dependency ordering | Must be handled in the command or wrapper | Unit relationships such as After=minecraft.service are explicit |
| Logging | Redirect to a file or facility | Integrated journal with exit status and timestamps |
| Missed runs | Usually skipped while the host is off | Persistent=true can run after boot |
| Per-server templating | Simple separate lines, but environment handling is manual | Template units and instance names scale cleanly |
For a single traditional host, cron is minimal and dependable. For multiple instances, dependency control, or audit-friendly logs, a systemd timer is usually easier to operate.
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RCON, screen, and tmux for console control
| Transport | Save-completion acknowledgement | Setup complexity | Residual consistency risk |
|---|---|---|---|
| RCON | Can confirm that the command completed; preferred by the reference documentation | Requires enabling RCON and protecting its password | Player-event saves can still occur after save-off |
| screen | Usually no structured completion response; use a tuned delay | Works when the server already runs in a screen session | Higher if the delay is too short or the console command is lost |
| tmux | Usually no structured completion response; use a tuned delay | Works when the server already runs in a tmux session | Higher if the delay is too short or the console command is lost |
Use RCON when possible. If screen or tmux is unavoidable, measure how long save-all takes on your world under normal load and add a safety margin before archiving. A fixed delay is not proof that all writes completed.
Retention and storage design
Keep generations deliberately
A backup directory without retention eventually fills the disk and can stop the server. The reference script supports thin, sequential, and none deletion modes together with a maximum-backup setting. A practical policy keeps frequent short-term copies, then fewer long-term copies—for example, hourly files for a day and selected daily files for several weeks. Implement the policy with separate jobs or a retention tool rather than deleting the only copy after a failed run.
Separate the failure domain
Do not place the only archive beside the live world on the same filesystem. A failed disk, accidental deletion, ransomware event, or filesystem corruption can destroy both. MCscripts documents linking an external drive as backup_dir; an external USB hard drive or SSD is therefore a straightforward destination. Keep at least one generation on storage that is physically separate from the host. An off-host copy provides stronger failure-domain separation, but requires network bandwidth, credentials management, privacy controls, and ongoing storage cost.
| Destination | Failure-domain separation | Restore bandwidth | Privacy and cost considerations |
|---|---|---|---|
| Second local disk | Protects against a failure of the primary disk, not theft or host-wide damage | Fast local restore | One-time hardware cost; access stays under your control |
| External USB HDD or SSD | Can be disconnected or moved away from the host | Fast when attached | Requires rotation, protection from loss, and enough capacity |
| Off-host storage | Best separation from a destroyed host or site | Depends on upload and download capacity | Recurring cost, account security, and jurisdiction/privacy choices |
How to verify and restore a backup
A successful tar command proves only that an archive was created. It does not prove the archive contains a usable world. Test every backup generation on a schedule, and test immediately after changing the script or server version.
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- Create a new, empty restore directory outside the production path:
mkdir -p /srv/minecraft-restore/test-2026-10-15. - List the archive before extraction:
tar -tzf /srv/minecraft-backups/minecraft-YYYY-MM-DDTHH-MM-SSZ.tar.gz. Confirm that all expected world directories are present. - Extract into the test directory:
tar -xzf /srv/minecraft-backups/minecraft-YYYY-MM-DDTHH-MM-SSZ.tar.gz -C /srv/minecraft-restore/test-2026-10-15. - Inspect region files, player data, level metadata, and the directory names. Check ownership and permissions before starting a test server.
- Run a separate test instance on the extracted files, join with an administrator account, and verify terrain, inventories, and recent changes.
- Only after the test succeeds, stop the production server, preserve the current directory as a rollback copy, and replace it with the restored directory.
The reference documentation explicitly advises testing backups and provides tar extraction as the restore method. Keep the failed or replaced production directory until the restored server has been observed through at least one normal save cycle.
Troubleshooting common failures
The server remains in read-only save mode
Check the journal or cron log for an RCON authentication error, a missing client binary, or a trap that could not connect. Send save-on manually through the console, then fix credentials and permissions before the next run. The cleanup trap cannot help if the console transport itself is unavailable.
The archive is missing a dimension
Compare the configured WORLDS array with the server's actual level-name and dimension directories. A custom level name or a proxy-managed world path must be listed explicitly. Run tar -tzf during verification so omissions are detected before an emergency restore.
Backups overlap or disk usage spikes
Keep the flock guard, monitor archive duration, and lower the schedule frequency if the world cannot be archived within the interval. Confirm that retention runs after a successful archive and that the backup destination has free space. Never delete the newest known-good generation merely to make room for a partial file.
The restore starts but rolls back recent activity
This is expected when restoring an older generation. Record the archive timestamp and communicate the recovery point to players. If an online backup shows inconsistent player data, use a maintenance-window backup for the authoritative restore instead.
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Quick Recap
Operational checklist
- Run the job as the dedicated
minecraftuser, with absolute paths. - Use RCON where possible; protect its credentials and verify command completion.
- Include every world directory and the server data needed to recreate the instance.
- Use a cleanup trap that always attempts
save-on. - Retain several generations and keep at least one copy on separate storage.
- Capture exit status in cron output or the system journal.
- Perform a real extraction and test-server restore, not just an archive listing.
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