diff --git a/scripts/backup.sh b/scripts/backup.sh
index 0256916..461f95e 100644
--- a/scripts/backup.sh
+++ b/scripts/backup.sh
@@ -5,10 +5,15 @@ set -e
 REPOSITORY=https://github.com/descartes-underwriting/devops-technical-test-data.git
 BRANCH=main
 DATA_DIR=$(pwd)/data
+# max number of commit to backup
 MAX_NUM=0
+# logs!
 VERBOSE=0
+# ignore tracking. Can be useful to fill missing commits
+# if 0 (and -i not used), will continue where it stopped.
+IGNORE_TRACK=0
 
-while getopts ":r:b:d:vxn:h" opt
+while getopts ":r:b:d:vxn:hi" opt
 do
     case ${opt} in
         r)
@@ -25,6 +30,9 @@ do
                 DATA_DIR=$(pwd)/${DATA_DIR}
             fi
             ;;
+        i)
+            IGNORE_TRACK=1
+            ;;
         n)
             MAX_NUM=${OPTARG}
             ;;
@@ -62,8 +70,14 @@ cd ${TMPDIR}
 
 git clone ${REPOSITORY} && cd ./*
 
+CURRENT_COMMIT=""
+if test -s ${DATA_DIR}/.track -a ${IGNORE_TRACK} -eq 0
+then
+    CURRENT_COMMIT=$(cat ${DATA_DIR}/.track)..
+fi
+
 # List all commit sha, from older to newer; 
-COMMIT_SHAS=$($GIT ${GIT_OPTS[@]} log --reverse --pretty=format:"%H" remotes/origin/${BRANCH})
+COMMIT_SHAS=$($GIT ${GIT_OPTS[@]} log --reverse --pretty=format:"%H" remotes/origin/${BRANCH} ${CURRENT_COMMIT})
 
 NUM_ADDED=0
 
@@ -124,6 +138,8 @@ do
 
     NUM_ADDED=$((NUM_ADDED + 1))
 
+    echo -n ${COMMIT_SHA} > ${DATA_DIR}/.track
+
     if test ${NUM_ADDED} -eq ${MAX_NUM}
     then
         echo "Max commit to backup reached; stopping."
diff --git a/tests/tests_cases/1/.track b/tests/tests_cases/1/.track
new file mode 100644
index 0000000..0e92c2b
--- /dev/null
+++ b/tests/tests_cases/1/.track
@@ -0,0 +1 @@
+282180fe7e5d9cbf297f2f0ef813cffe60ce2328
\ No newline at end of file
diff --git a/tests/tests_cases/10/.track b/tests/tests_cases/10/.track
new file mode 100644
index 0000000..3872986
--- /dev/null
+++ b/tests/tests_cases/10/.track
@@ -0,0 +1 @@
+729e5d2addf0a3566e454ddccf549041f2e9ab17
\ No newline at end of file
diff --git a/tests/tests_cases/2/.track b/tests/tests_cases/2/.track
new file mode 100644
index 0000000..e82cc0d
--- /dev/null
+++ b/tests/tests_cases/2/.track
@@ -0,0 +1 @@
+46fe26c9dcf2354a0ed3f304ed6818de9606f7b5
\ No newline at end of file
diff --git a/tests/tests_cases/99/.track b/tests/tests_cases/99/.track
new file mode 100644
index 0000000..7186375
--- /dev/null
+++ b/tests/tests_cases/99/.track
@@ -0,0 +1 @@
+13fe0cca86cc6b12592e794c22e26bf4f3c52f9e
\ No newline at end of file