diff --git a/backup.sh b/backup.sh
index 9ad262e..d6be4e9 100755
--- a/backup.sh
+++ b/backup.sh
@@ -199,12 +199,12 @@ function svcSeafile {
                 pidShub=$(pgrep -f "seahub")
                 pidSeaf=$(pgrep -f seafile-controller)
                 # force stop seahub
-                if [ $pidShub ]; then
+                if [ "$pidShub" ]; then
                     pkill -f "seahub"
                     exitWarn+=("[$(stamp)]_101")
                 fi
                 # force stop seafile
-                if [ $pidSeaf ]; then
+                if [ "$pidSeaf" ]; then
                     pkill -f seafile-controller
                     exitWarn+=("[$(stamp)]_101")
                 fi
@@ -733,7 +733,7 @@ if [ -z "$borgExclude" ]; then
     # borgExclude is empty
     echo -e "${info}[$(stamp)] --[INFO] Executing borg without exclusions --" \
         "${normal}" >> "$logFile"
-    borg --show-rc create ${borgCreateParams} ::`date +%Y-%m-%d_%H%M%S` \
+    borg --show-rc create ${borgCreateParams} ::"$(date +%Y-%m-%d_%H%M%S)" \
         "${xtraFiles[@]}" \
         "${sqlDumpDir}" "${dataDir}" \
         2>> "$logFile"
@@ -742,7 +742,7 @@ else
     echo -e "${info}[$(stamp)] --[INFO] Executing borg with exclusions --" \
         "${normal}" >> "$logFile"
     borg --show-rc create ${borgCreateParams} --exclude-from "${borgExclude}" \
-        ::`date +%Y-%m-%d_%H%M%S` \
+        ::"$(date +%Y-%m-%d_%H%M%S)" \
         "${xtraFiles[@]}" \
         "${sqlDumpDir}" "${dataDir}" \
         2>> "$logFile"