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+#!/bin/bash
+
+# Minecraft server automatic backup management script
+# by Nicolas Chan
+# MIT License
+# 
+# For Minecraft servers running in a GNU screen.
+# For most convenience, run automatically with cron.
+
+# Configuration
+SCREEN_NAME="PrivateSurvival" # Name of the GNU Screen your Minecraft server is running in
+SERVER_DIRECTORY="/home/server/MinecraftServers/PrivateSurvival" # Server directory, NOT the world; world is SERVER_DIRECTORY/world
+BACKUP_DIRECTORY="/media/server/ExternalStorage/Backups/PrivateSurvivalBackups" # Directory to save backups in
+NUMBER_OF_BACKUPS_TO_KEEP=128 # -1 indicates unlimited
+DELETE_METHOD="thin" # Choices: thin, sequential, none; sequential: delete oldest; thin: keep last 24 hourly, last 30 daily, and monthly (use with 1 hr cron interval)
+COMPRESSION_ALGORITHM="zstd" # Leave empty for no compression
+COMPRESSION_FILE_EXTENSION=".zst" # Leave empty for no compression; Precede with a . (for example: ".gz")
+COMPRESSION_LEVEL=3 # Passed to the compression algorithm
+ENABLE_CHAT_MESSAGES=true # Tell players in Minecraft chat about backup status
+PREFIX="Backup" # Shows in the chat message
+DEBUG=true # Enable debug messages
+
+# Other Variables (do not modify)
+DATE_FORMAT="%F_%H-%M-%S"
+TIMESTAMP=$(date +$DATE_FORMAT)
+ARCHIVE_FILE_NAME=$TIMESTAMP.tar$COMPRESSION_FILE_EXTENSION
+ARCHIVE_PATH=$BACKUP_DIRECTORY/$ARCHIVE_FILE_NAME
+
+# Minecraft server screen interface functions
+message-players () {
+  local MESSAGE=$1
+  local HOVER_MESSAGE=$2
+  echo "$MESSAGE ($HOVER_MESSAGE)"
+  if $ENABLE_CHAT_MESSAGES; then
+    screen -S $SCREEN_NAME -p 0 -X stuff "tellraw @a [\"\",{\"text\":\"[$PREFIX] \",\"color\":\"gray\",\"italic\":true},{\"text\":\"$MESSAGE\",\"color\":\"gray\",\"italic\":true,\"hoverEvent\":{\"action\":\"show_text\",\"value\":{\"text\":\"\",\"extra\":[{\"text\":\"$HOVER_MESSAGE\"}]}}}]$(printf \\r)"
+  fi
+}
+execute-command () {
+  local COMMAND=$1
+  screen -S $SCREEN_NAME -p 0 -X stuff "$COMMAND$(printf \\r)"
+}
+
+# Notify players of start
+message-players "Starting backup..." "$ARCHIVE_FILE_NAME"
+
+# Sequential delete method
+delete-sequentially () {
+  local BACKUPS=($(ls $BACKUP_DIRECTORY))
+  while [[ $NUMBER_OF_BACKUPS_TO_KEEP -ge 0 && ${#BACKUPS[@]} -ge $NUMBER_OF_BACKUPS_TO_KEEP ]]; do
+    rm $BACKUP_DIRECTORY/${BACKUPS[0]}
+    message-players "Deleted old backup" "${BACKUPS[0]}"
+    BACKUPS=($(ls $BACKUP_DIRECTORY))
+  done
+}
+
+# Thinning delete method
+delete-thinning () {
+  local HOURLY_BLOCK_SIZE=24
+  local DAILY_BLOCK_SIZE=30
+  local BACKUPS=($(ls -r $BACKUP_DIRECTORY)) # List newest first
+  
+  local OLDEST_HOURLY_BACKUP=${BACKUPS[HOURLY_BLOCK_SIZE - 1]}
+  local OLDEST_HOURLY_BACKUP_HOUR=${OLDEST_HOURLY_BACKUP:11:2}
+
+  # DEBUG: Log the oldest hourly backup to console
+  if $DEBUG; then
+    echo "Oldest hourly backup is: $OLDEST_HOURLY_BACKUP"
+  fi
+
+  # If the oldest hourly backup was not at midnight, delete it
+  if [[ "$OLDEST_HOURLY_BACKUP_HOUR" -ne "00" ]] && [[ "$OLDEST_HOURLY_BACKUP" != "" ]]; then
+    rm $BACKUP_DIRECTORY/$OLDEST_HOURLY_BACKUP
+    message-players "Deleted old backup" "$OLDEST_HOURLY_BACKUP"
+  else
+    # Oldest hourly backup was at midnight, so it is now a daily backup
+    local OLDEST_DAILY_BACKUP=${BACKUPS[HOURLY_BLOCK_SIZE + DAILY_BLOCK_SIZE - 1]}
+    local OLDEST_DAILY_BACKUP_DAY=${OLDEST_DAILY_BACKUP:8:2}
+
+    # DEBUG: Log the oldest hourly backup to console
+    if $DEBUG; then
+      echo "Oldest daily backup is: $OLDEST_DAILY_BACKUP"
+    fi
+
+    # If the oldest daily backup was not on the 1st, delete it
+    if [[ "$OLDEST_DAILY_BACKUP_DAY" -ne "01" ]] && [[ "$OLDEST_DAILY_BACKUP" != "" ]]; then
+      rm $BACKUP_DIRECTORY/$OLDEST_DAILY_BACKUP
+      message-players "Deleted old backup" "$OLDEST_DAILY_BACKUP"
+    else
+      # Oldest daily backup was on the 1st, so it is now a monthly backup
+      delete-sequentially # Delete old monthly backups
+    fi
+  fi
+}
+
+# Delete old backups
+case $DELETE_METHOD in
+  "sequential") delete-sequentially
+    ;;
+  "thin") delete-thinning
+    ;;
+esac
+
+# Disable world autosaving
+execute-command "save-off"
+
+# Backup world
+START_TIME=$(date +"%s")
+case $COMPRESSION_ALGORITHM in
+  "") # No compression
+    tar -cf $ARCHIVE_PATH -C $SERVER_DIRECTORY world
+    ;;
+  *) # With compression
+    tar -cf - -C $SERVER_DIRECTORY world | $COMPRESSION_ALGORITHM -cv -$COMPRESSION_LEVEL - > $ARCHIVE_PATH
+    ;;
+esac
+sync $ARCHIVE_PATH
+END_TIME=$(date +"%s")
+
+# Enable world autosaving
+execute-command "save-on"
+
+# Save the world
+execute-command "save-all"
+
+# Notify players of completion
+WORLD_SIZE_KB=$(du --max-depth=0 $SERVER_DIRECTORY/world | awk '{print $1}')
+ARCHIVE_SIZE_KB=$(du $ARCHIVE_PATH | awk '{print $1}')
+COMPRESSION_PERCENT=$(($ARCHIVE_SIZE_KB * 100 / $WORLD_SIZE_KB))
+ARCHIVE_SIZE=$(du -h $ARCHIVE_PATH | awk '{print $1}')
+BACKUP_DIRECTORY_SIZE=$(du -h --max-depth=0 $BACKUP_DIRECTORY | awk '{print $1}')
+TIME_DELTA=$((END_TIME - START_TIME))
+
+message-players "Backup complete!" "$TIME_DELTA s, $ARCHIVE_SIZE/$BACKUP_DIRECTORY_SIZE, $COMPRESSION_PERCENT%"
+