IS_BACKUPUPTODATE Check all files

Check time of last data modification of all files
under $backup_dir. That will include files like
$backup_dir/mysql/dump.sql.gz

evocheck.sh

@@ -716,12 +716,11 @@ check_backupuptodate() {
     backup_dir="/home/backup"
     if [ -d "${backup_dir}" ]; then
         if [ -n "$(ls -A ${backup_dir})" ]; then
-            # shellcheck disable=SC2231
-            for file in ${backup_dir}/*; do
+            find "${backup_dir}" -type f | while read -r file; do
                 limit=$(date +"%s" -d "now - 2 day")
                 updated_at=$(stat -c "%Y" "$file")
 
-                if [ -f "$file" ] && [ "$limit" -gt "$updated_at" ]; then
+                if [ "$limit" -gt "$updated_at" ]; then
                     failed "IS_BACKUPUPTODATE" "$file has not been backed up"
                     test "${VERBOSE}" = 1 || break;
                 fi