diff --git a/README.md b/README.md
index f08f143..6bfe54a 100644
--- a/README.md
+++ b/README.md
@@ -56,7 +56,7 @@ Command line options:
 -e    Compression file extension, exclude leading "." (default: gz)
 -f    Output file name (default is the timestamp)
 -h    Shows this help text
--i    Input directory (path to world folder)
+-i    Input directory (path to world folder, use -i once for each world)
 -l    Compression level (default: 3)
 -m    Maximum backups to keep, use -1 for unlimited (default: 128)
 -o    Output directory
@@ -87,7 +87,7 @@ cd restored-world
 tar -xzvf /path/to/backups/2019-04-09_02-15-01.tar.gz
 ```
 
-Then you can move your restored world (`restored-world` in this case) to your Minecraft server folder and rename it (usually called `world`) so the Minecraft server uses it.
+The restored worlds should be inside the `restored-world` directory, possibly nested under the parent directories. Then you can move your restored world to your Minecraft server folder under the proper name and path so the Minecraft server uses it.
 
 ### With `restic`
 Use [`restic restore`](https://restic.readthedocs.io/en/latest/050_restore.html) to restore from backup.
diff --git a/backup.sh b/backup.sh
index 33c77ba..5778e51 100755
--- a/backup.sh
+++ b/backup.sh
@@ -9,7 +9,7 @@
 
 # Default Configuration 
 SCREEN_NAME="" # Name of the GNU Screen, tmux session, or hostname:port:password for RCON
-SERVER_WORLD="" # Server world directory
+SERVER_WORLDS=() # Server world directory
 BACKUP_DIRECTORY="" # Directory to save backups in
 MAX_BACKUPS=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)
@@ -40,7 +40,7 @@ debug-log () {
   fi
 }
 
-while getopts 'a:cd:e:f:hi:l:m:o:p:qr:s:t:u:vw:' FLAG; do
+while getopts 'a:cd:e:f:hi:l:m:o:p:qr:s:t:u:vw:x' FLAG; do
   case $FLAG in
     a) COMPRESSION_ALGORITHM=$OPTARG ;;
     c) ENABLE_CHAT_MESSAGES=true ;;
@@ -55,7 +55,7 @@ while getopts 'a:cd:e:f:hi:l:m:o:p:qr:s:t:u:vw:' FLAG; do
        echo "-e    Compression file extension, exclude leading \".\" (default: gz)"
        echo "-f    Output file name (default is the timestamp)"
        echo "-h    Shows this help text"
-       echo "-i    Input directory (path to world folder)"
+       echo "-i    Input directory (path to world folder, use -i once for each world)"
        echo "-l    Compression level (default: 3)"
        echo "-m    Maximum backups to keep, use -1 for unlimited (default: 128)"
        echo "-o    Output directory"
@@ -67,9 +67,10 @@ while getopts 'a:cd:e:f:hi:l:m:o:p:qr:s:t:u:vw:' FLAG; do
        echo "-u    Lock file timeout seconds (empty = unlimited)"
        echo "-v    Verbose mode"
        echo "-w    Window manager: screen (default), tmux, RCON"
+       echo "-x    Bukkit-style server backup mode (world files are split by dimension)"
        exit 0
        ;;
-    i) SERVER_WORLD=$OPTARG ;;
+    i) SERVER_WORLDS+=("$OPTARG") ;;
     l) COMPRESSION_LEVEL=$OPTARG ;;
     m) MAX_BACKUPS=$OPTARG ;;
     o) BACKUP_DIRECTORY=$OPTARG ;;
@@ -216,7 +217,7 @@ if ! $SUPPRESS_WARNINGS; then
 fi
 # Check for required arguments
 MISSING_CONFIGURATION=false
-if [[ "$SERVER_WORLD" == "" ]]; then
+if [[ "${#SERVER_WORLDS[@]}" == "0" ]]; then
   log-fatal "Server world not specified (use -i)"
   MISSING_CONFIGURATION=true
 fi
@@ -442,7 +443,7 @@ clean-up () {
   TIME_DELTA=$((END_TIME - START_TIME))
 
   if [[ "$BACKUP_DIRECTORY" != "" ]]; then
-    WORLD_SIZE_BYTES=$(du -b --max-depth=0 "$SERVER_WORLD" | awk '{print $1}')
+    WORLD_SIZE_BYTES=$(du --bytes --total --max-depth=0 "${SERVER_WORLDS[@]}" | tail -n 1 | awk '{print $1}')
     ARCHIVE_SIZE_BYTES=$(du -b "$ARCHIVE_PATH" | awk '{print $1}')
     ARCHIVE_SIZE=$(du -h "$ARCHIVE_PATH" | awk '{print $1}')
     BACKUP_DIRECTORY_SIZE=$(du -h --max-depth=0 "$BACKUP_DIRECTORY" | awk '{print $1}')
@@ -491,10 +492,10 @@ do-backup () {
 
     case $COMPRESSION_ALGORITHM in
       # No compression
-      "") tar -cf "$ARCHIVE_PATH" -C "$SERVER_WORLD" .
+      "") tar -cf "$ARCHIVE_PATH" "${SERVER_WORLDS[@]}"
         ;;
       # With compression
-      *) tar -cf - -C "$SERVER_WORLD" . | $COMPRESSION_ALGORITHM -cv -"$COMPRESSION_LEVEL" - > "$ARCHIVE_PATH" 2>> /dev/null
+      *) tar -cf - "${SERVER_WORLDS[@]}" | $COMPRESSION_ALGORITHM -cv -"$COMPRESSION_LEVEL" - > "$ARCHIVE_PATH" 2>> /dev/null
         ;;
     esac
     EXIT_CODES=("${PIPESTATUS[@]}")
@@ -516,7 +517,7 @@ do-backup () {
 
   if [[ "$RESTIC_REPO" != "" ]]; then
     RESTIC_TIMESTAMP="${TIMESTAMP:0:10} ${TIMESTAMP:11:2}:${TIMESTAMP:14:2}:${TIMESTAMP:17:2}"
-    restic backup -r "$RESTIC_REPO" "$SERVER_WORLD" --time "$RESTIC_TIMESTAMP" "$QUIET"
+    restic backup -r "$RESTIC_REPO" "${SERVER_WORLDS[@]}" --time "$RESTIC_TIMESTAMP" "$QUIET"
     ARCHIVE_EXIT_CODE=$?
     if [ "$ARCHIVE_EXIT_CODE" -eq 3 ]; then
       log-warning "Incomplete snapshot taken (some files could not be read)"
diff --git a/test/test.sh b/test/test.sh
index 6bbaf20..9fb69dc 100755
--- a/test/test.sh
+++ b/test/test.sh
@@ -62,7 +62,7 @@ check-backup-full-paths () {
   WORLD_DIR="$2"
   mkdir -p "$TEST_TMP/restored"
   tar --extract --file "$BACKUP_ARCHIVE" --directory "$TEST_TMP/restored"
-  assert-equals-directory "$WORLD_DIR" "$TEST_TMP/restored"
+  assert-equals-directory "$WORLD_DIR" "$TEST_TMP/restored/$WORLD_DIR"
   rm -rf "$TEST_TMP/restored"
 }
 
@@ -80,6 +80,46 @@ check-latest-backup-restic () {
 
 # Tests
 
+test-backup-defaults () {
+  TIMESTAMP="$(date +%F_%H-%M-%S --date="2021-01-01")"
+  ./backup.sh -i "$TEST_TMP/server/world" -o "$TEST_TMP/backups" -s "$SCREEN_TMP" -f "$TIMESTAMP"
+  check-backup "$TIMESTAMP.tar.gz"
+}
+
+test-backup-multiple-worlds () {
+  TIMESTAMP="$(date +%F_%H-%M-%S --date="2021-01-01")"
+  cp -r "$TEST_TMP/server/world" "$TEST_TMP/server/world_nether"
+  cp -r "$TEST_TMP/server/world" "$TEST_TMP/server/world_the_end"
+  ./backup.sh -i "$TEST_TMP/server/world" -i "$TEST_TMP/server/world_nether" -i "$TEST_TMP/server/world_the_end" -o "$TEST_TMP/backups" -s "$SCREEN_TMP" -f "$TIMESTAMP"
+  mkdir -p "$TEST_TMP/restored"
+  tar --extract --file "$TEST_TMP/backups/$TIMESTAMP.tar.gz" --directory "$TEST_TMP/restored"
+  assert-equals-directory "$TEST_TMP/server/world" "$TEST_TMP/restored/$TEST_TMP/server/world"
+  assert-equals-directory "$TEST_TMP/server/world_nether" "$TEST_TMP/restored/$TEST_TMP/server/world_nether"
+  assert-equals-directory "$TEST_TMP/server/world_the_end" "$TEST_TMP/restored/$TEST_TMP/server/world_the_end"
+}
+
+test-file-changed-as-read-warning () {
+  TIMESTAMP="$(date +%F_%H-%M-%S --date="2021-01-01")"
+  dd if=/dev/urandom of="$TEST_TMP/server/world/random" &
+  DD_PID="$!"
+  OUTPUT="$(./backup.sh -i "$TEST_TMP/server/world" -o "$TEST_TMP/backups" -s "$SCREEN_TMP" -f "$TIMESTAMP" 2>&1)"
+  EXIT_CODE="$?"
+  kill "$DD_PID"
+  assertEquals 0 "$EXIT_CODE"
+  assertContains "$OUTPUT" "Some files may differ in the backup archive"
+
+  # Check that the backup actually resulted in a valid tar 
+  assertTrue '[ -f '"$TEST_TMP/backups/$TIMESTAMP.tar.gz"' ]'
+
+  mkdir -p "$TEST_TMP/restored"
+  tar --extract --file "$TEST_TMP/backups/$TIMESTAMP.tar.gz" --directory "$TEST_TMP/restored"
+  assert-equals-directory "$WORLD_DIR/file1.txt" "$TEST_TMP/restored/$WORLD_DIR/file1.txt"
+  assert-equals-directory "$WORLD_DIR/file2.txt" "$TEST_TMP/restored/$WORLD_DIR/file2.txt"
+  assert-equals-directory "$WORLD_DIR/file3.txt" "$TEST_TMP/restored/$WORLD_DIR/file3.txt"
+}
+
+
+
 test-lock-defaults () {
   TIMESTAMP="$(date +%F_%H-%M-%S --date="2021-01-01")"
   ./backup.sh -t "$TEST_TMP/lockfile" -i "$TEST_TMP/server/world" -o "$TEST_TMP/backups" -s "$SCREEN_TMP" -f "$TIMESTAMP"
@@ -183,11 +223,6 @@ test-restic-defaults () {
   check-latest-backup-restic
 }
 
-test-backup-defaults () {
-  TIMESTAMP="$(date +%F_%H-%M-%S --date="2021-01-01")"
-  ./backup.sh -i "$TEST_TMP/server/world" -o "$TEST_TMP/backups" -s "$SCREEN_TMP" -f "$TIMESTAMP"
-  check-backup "$TIMESTAMP.tar.gz"
-}
 
 test-backup-spaces-in-directory () {
   TIMESTAMP="$(date +%F_%H-%M-%S --date="2021-01-01")"
@@ -293,26 +328,6 @@ test-nonzero-exit-warning () {
   assertFalse '[ -f '"$TEST_TMP/backups/$TIMESTAMP.tar.gz"' ]'
 }
 
-test-file-changed-as-read-warning () {
-  TIMESTAMP="$(date +%F_%H-%M-%S --date="2021-01-01")"
-  dd if=/dev/urandom of="$TEST_TMP/server/world/random" &
-  DD_PID="$!"
-  OUTPUT="$(./backup.sh -i "$TEST_TMP/server/world" -o "$TEST_TMP/backups" -s "$SCREEN_TMP" -f "$TIMESTAMP" 2>&1)"
-  EXIT_CODE="$?"
-  kill "$DD_PID"
-  assertEquals 0 "$EXIT_CODE"
-  assertContains "$OUTPUT" "Some files may differ in the backup archive"
-
-  # Check that the backup actually resulted in a valid tar 
-  assertTrue '[ -f '"$TEST_TMP/backups/$TIMESTAMP.tar.gz"' ]'
-
-  mkdir -p "$TEST_TMP/restored"
-  tar --extract --file "$TEST_TMP/backups/$TIMESTAMP.tar.gz" --directory "$TEST_TMP/restored"
-  assert-equals-directory "$WORLD_DIR/file1.txt" "$TEST_TMP/restored/file1.txt"
-  assert-equals-directory "$WORLD_DIR/file2.txt" "$TEST_TMP/restored/file2.txt"
-  assert-equals-directory "$WORLD_DIR/file3.txt" "$TEST_TMP/restored/file3.txt"
-}
-
 test-screen-interface () {
   TIMESTAMP="$(date +%F_%H-%M-%S --date="2021-01-01")"
   ./backup.sh -i "$TEST_TMP/server/world" -o "$TEST_TMP/backups" -s "$SCREEN_TMP" -f "$TIMESTAMP"