Add BACKUP_MODE extraction from CONFIG_FILE

Author: regnare

update.sh

@@ -417,6 +417,7 @@ READ_CONFIG () {
   KEEP_SNAPSHOT=$(awk -F'"' '/^KEEP_SNAPSHOT/ {print $2}' "$CONFIG_FILE")
   BACKUP=$(awk -F'"' '/^BACKUP=/ {print $2}' "$CONFIG_FILE")
   BACKUP_LXC_MP=$(awk -F'"' '/^BACKUP_LXC_MP=/ {print $2}' "$CONFIG_FILE")
+  BACKUP_MODE=$(awk -F'"' '/^BACKUP_MODE=/ {print $2}' "$CONFIG_FILE")
   LXC_START_DELAY=$(awk -F'"' '/^LXC_START_DELAY=/ {print $2}' "$CONFIG_FILE")
   VM_START_DELAY=$(awk -F'"' '/^VM_START_DELAY=/ {print $2}' "$CONFIG_FILE")
   EXTRA_GLOBAL=$(awk -F'"' '/^EXTRA_GLOBAL=/ {print $2}' "$CONFIG_FILE")