diff --git a/lib/bkctld-inc b/lib/bkctld-inc
index 3ee7fb8..2f359ee 100755
--- a/lib/bkctld-inc
+++ b/lib/bkctld-inc
@@ -15,11 +15,22 @@ for jail in $("${LIBDIR}/bkctld-list"); do
         jail_inode=$(stat --format=%i "${JAILDIR}/${jail}")
         if [ "$jail_inode" -eq 256 ]; then
             /bin/btrfs subvolume snapshot -r "${JAILDIR}/${jail}" "${inc}" | debug
+            end=$(date +"%H:%M:%S")
+            notice "${jail} : made ${date} inc [${start}/${end}]"
         else
-            cp -alx "${JAILDIR}/${jail}/" "${inc}" | debug
+            lock="/run/lock/bkctld/inc-${jail}.lock"
+            if [ -f "${lock}" ]; then
+                warning "${jail} : trying to run already running inc"
+            else
+                (
+                    mkdir -p /run/lock/bkctld && touch "${lock}"
+                    trap "rm -f ${lock}" 0
+                    cp -alx "${JAILDIR}/${jail}/" "${inc}"
+                    end=$(date +"%H:%M:%S")
+                    notice "${jail} : made ${date} inc [${start}/${end}]"
+                ) &
+            fi
         fi
-        end=$(date +"%H:%M:%S")
-        notice "${jail} : made ${date} inc [${start}/${end}]"
     else
         warning "${jail} : trying to made already existant inc"
     fi
diff --git a/lib/bkctld-rm b/lib/bkctld-rm
index 1e79a36..1139b65 100755
--- a/lib/bkctld-rm
+++ b/lib/bkctld-rm
@@ -6,19 +6,6 @@
 
 LIBDIR="$(dirname $0)" && . "${LIBDIR}/config"
 
-empty="/tmp/bkctld-${$}-$(date +%N))"
-mkdir "${empty}"
-pidfile="/var/run/bkctld-rm.pid"
-if [ -f "${pidfile}" ]; then
-    pid=$(cat "${pidfile}")
-    ps -u "${pid}" >/dev/null
-    if [ "${?}" -eq 0 ]; then
-        kill -9 "${pid}"
-        warning "${0} rm always run (PID ${pid}), killed by ${$} !"
-    fi
-    rm "${pidfile}"
-    fi
-echo "${$}" > "${pidfile}"
 for jail in $("${LIBDIR}/bkctld-list"); do
     incs=$(ls "${INCDIR}/${jail}")
     if [ -f "${CONFDIR}/${jail}" ]; then
@@ -33,16 +20,25 @@ for jail in $("${LIBDIR}/bkctld-list"); do
             inc_inode=$(stat --format=%i "${INCDIR}/${jail}/${j}")
             if [ "${inc_inode}" -eq 256 ]; then
                 /bin/btrfs subvolume delete "${INCDIR}/${jail}/${j}" | debug
+                end=$(date +"%H:%M:%S")
+                notice "${jail} : deleted ${j} inc [${start}/${end}]"
             else
-                cd "${INCDIR}/${jail}"
-                rsync -a --delete "${empty}/" "${j}/"
-                rmdir "${j}"
+                lock="/run/lock/bkctld/rm-${jail}.lock"
+                if [ -f "${lock}" ]; then
+                    warning "${jail} : trying to run already running rm"
+                else
+                    (
+                        empty="/tmp/bkctld-${$}-$(date +%N)"
+                        mkdir -p /run/lock/bkctld && touch "${lock}" && mkdir -p "${empty}"
+                        trap "rm -f ${lock} && rmdir ${empty}" 0
+                        rsync -a --delete "${empty}/" "${INCDIR}/${jail}/${j}/"
+                        rmdir "${j}"
+                        end=$(date +"%H:%M:%S")
+                        notice "${jail} : deleted ${j} inc [${start}/${end}]"
+                    ) &
+                fi
             fi
-            end=$(date +"%H:%M:%S")
-            notice "${jail} : deleted ${j} inc [${start}/${end}]"
         done
         rm "${keepfile}"
     fi
 done
-rmdir "${empty}"
-rm "${pidfile}"