diff --git a/scripts/_common.sh b/scripts/_common.sh
new file mode 100644
index 0000000..bb04a03
--- /dev/null
+++ b/scripts/_common.sh
@@ -0,0 +1,13 @@
+#!/bin/bash
+
+# ============= FUTURE YUNOHOST HELPER =============
+# Delete a file checksum from the app settings
+#
+# $app should be defined when calling this helper
+#
+# usage: ynh_remove_file_checksum file
+# | arg: file - The file for which the checksum will be deleted
+ynh_delete_file_checksum () {
+	local checksum_setting_name=checksum_${1//[\/ ]/_}	# Replace all '/' and ' ' by '_'
+	ynh_app_setting_delete $app $checksum_setting_name
+}
\ No newline at end of file
diff --git a/scripts/backup b/scripts/backup
index 1d0109b..90f0a37 100644
--- a/scripts/backup
+++ b/scripts/backup
@@ -5,6 +5,8 @@
 #=================================================
 # IMPORT GENERIC HELPERS
 #=================================================
+
+source ../settings/scripts/_common.sh
 source /usr/share/yunohost/helpers
 
 #=================================================
diff --git a/scripts/install b/scripts/install
index ab1bc82..ae47673 100755
--- a/scripts/install
+++ b/scripts/install
@@ -1,9 +1,12 @@
 #!/bin/bash
+
 #=================================================
 # GENERIC START
 #=================================================
 # IMPORT GENERIC HELPERS
 #=================================================
+
+source _common.sh
 source _future.sh
 source ynh_systemd_action
 source /usr/share/yunohost/helpers
diff --git a/scripts/remove b/scripts/remove
index f0cfa95..a5cea32 100755
--- a/scripts/remove
+++ b/scripts/remove
@@ -1,9 +1,12 @@
 #!/bin/bash
+
 #=================================================
-# GENERIC STARTING
+# GENERIC START
 #=================================================
 # IMPORT GENERIC HELPERS
 #=================================================
+
+source _common.sh
 source _future.sh
 source /usr/share/yunohost/helpers
 
diff --git a/scripts/restore b/scripts/restore
index 41a87f1..c5f84f4 100644
--- a/scripts/restore
+++ b/scripts/restore
@@ -5,6 +5,8 @@
 #=================================================
 # IMPORT GENERIC HELPERS
 #=================================================
+
+source ../settings/scripts/_common.sh
 source ../settings/scripts/_future.sh
 source ../settings/scripts/ynh_systemd_action
 source /usr/share/yunohost/helpers
diff --git a/scripts/upgrade b/scripts/upgrade
index 357efd5..c4f992c 100644
--- a/scripts/upgrade
+++ b/scripts/upgrade
@@ -6,7 +6,7 @@
 # IMPORT GENERIC HELPERS
 #=================================================
 
-source _future.sh
+source _common.sh
 source ynh_systemd_action
 source /usr/share/yunohost/helpers