diff --git a/backup.sh b/backup.sh
index 8a24b79..713ff1c 100755
--- a/backup.sh
+++ b/backup.sh
@@ -34,7 +34,7 @@ SNAPSHOT_DATASETS=""
 
 debug()
 {
-    if [ "$BG_DEBUG_MODE" = "TRUE" ]; then
+    if [ "$ZB_DEBUG_MODE" = "TRUE" ]; then
         echo $@
     fi
 }
@@ -103,7 +103,7 @@ list_remote_datasets() {
                 dataset=`echo \\$dataset|cut -d: -f2`
                 zfs list -H $zroot\$dataset;
             done'"
-        if [ $BG_TEST_MODE = "TRUE" ]; then
+        if [ $ZB_TEST_MODE = "TRUE" ]; then
             echo ssh $SSH_SEND_OPTS -o port=$ssh_port $user@$addr $run_cmd
         else
             ssh $SSH_SEND_OPTS -o port=$ssh_port $user@$addr $run_cmd
@@ -133,7 +133,7 @@ zfs_allow_origin()
 {
     for dataset in $SEND_DATASETS; do
         dataset=`echo $dataset|cut -d: -f1`
-        if [ $BG_TEST_MODE = "TRUE" ]; then
+        if [ $ZB_TEST_MODE = "TRUE" ]; then
             echo zfs allow -u $LOCAL_USER $ORIGIN_PERMS $dataset
         else
             zfs allow -u $LOCAL_USER $ORIGIN_PERMS $dataset
@@ -157,7 +157,7 @@ zfs_allow_mirrors()
                 zfs allow -u $user $MIRROR_PERMS $zroot\$dataset
             done
         "
-        if [ $BG_TEST_MODE = "TRUE" ]; then
+        if [ $ZB_TEST_MODE = "TRUE" ]; then
             echo ssh $SSH_SEND_OPTS -o port=$ssh_port $user@$addr $run_cmd
                 
         else
@@ -170,7 +170,7 @@ create_snapshots()
 {
     snapshot_id="`date -I`-`date +%s`-$LOCAL_TZ"
     for dataset in $SNAPSHOT_DATASETS; do
-        if [ $BG_TEST_MODE = "TRUE" ]; then
+        if [ $ZB_TEST_MODE = "TRUE" ]; then
             echo zfs snapshot $ZFS_SNAPSHOT_OPTS $dataset@$snapshot_id
         else    
 	        zfs snapshot $ZFS_SNAPSHOT_OPTS $dataset@$snapshot_id
@@ -200,7 +200,7 @@ send_latest()
                     $user@$addr                                    \
                     zfs recv $ZFS_RECV_OPTS $zroot$remote_dataset
                 "
-            if [ $BG_TEST_MODE = "TRUE" ]; then
+            if [ $ZB_TEST_MODE = "TRUE" ]; then
                 echo $run_cmd
             else
                 $run_cmd
@@ -232,7 +232,7 @@ send_increment()
                 ssh $SSH_SEND_OPTS -o port=$ssh_port $user@$addr     \
                         zfs recv $ZFS_RECV_OPTS $zroot$remote_dataset
             "
-            if [ $BG_TEST_MODE = "TRUE" ]; then
+            if [ $ZB_TEST_MODE = "TRUE" ]; then
                 echo $run_cmd
             else
                 $run_cmd
@@ -249,15 +249,15 @@ set -- `getopt "tdl:" "$@"` || {
     echo "Usage: `basename $0` [-tdl] [command]" 1>&2
     exit 1
 }
-BG_TEST_MODE=FALSE
+ZB_TEST_MODE=FALSE
 while :; do
     case "$1" in
         -t)
-            BG_TEST_MODE=TRUE
+            ZB_TEST_MODE=TRUE
             echo Test mode.
         ;;
         -d)
-            BG_DEBUG_MODE=TRUE
+            ZB_DEBUG_MODE=TRUE
             ZFS_SEND_OPTS="$ZFS_SEND_OPTS -v"
             # Current on by default.
             # ZFS_RECV_OPTS="$ZFS_RECV_OPTS -v"