diff --git a/src/main/java/eu/openaire/urls_worker/components/ScheduledTasks.java b/src/main/java/eu/openaire/urls_worker/components/ScheduledTasks.java
index bcf5de5..917dc9e 100644
--- a/src/main/java/eu/openaire/urls_worker/components/ScheduledTasks.java
+++ b/src/main/java/eu/openaire/urls_worker/components/ScheduledTasks.java
@@ -197,7 +197,7 @@ public class ScheduledTasks {
                 }
             }
         } catch (Exception e) {
-            logger.error("", e);
+            logger.error("Failed to check and delete leftover fulltext files!", e);
             return;
         }
 
diff --git a/src/main/java/eu/openaire/urls_worker/controllers/FullTextsController.java b/src/main/java/eu/openaire/urls_worker/controllers/FullTextsController.java
index d9270d0..7d9e632 100644
--- a/src/main/java/eu/openaire/urls_worker/controllers/FullTextsController.java
+++ b/src/main/java/eu/openaire/urls_worker/controllers/FullTextsController.java
@@ -28,7 +28,7 @@ import java.util.List;
 @RequestMapping("full-texts/")
 public class FullTextsController {
 
-    private static final Logger logger = LoggerFactory.getLogger(GeneralController.class);
+    private static final Logger logger = LoggerFactory.getLogger(FullTextsController.class);
 
     @Autowired
     private FileStorageService fileStorageService;
@@ -68,8 +68,9 @@ public class FullTextsController {
 
         File zstdFile = FilesCompressor.compressMultipleFilesIntoOne(assignmentsCounter, batchCounter, fileNamesWithExtensions, currentAssignmentsBaseFullTextsPath);
         if ( zstdFile == null ) {
-            // The failed files (including the ".tar"), have already been deleted.
-            String errorMsg = "Failed to create the zstd file for \"batchCounter\"-" + batchCounter;
+            // The failed files (including the ".tar" and ".zstd"), have already been deleted.
+            deleteDirectory(new File(currentAssignmentsBaseFullTextsPath)); // Delete this assignments' directory.
+            String errorMsg = "Failed to compress the full-text files for batch_" + batchCounter + ", assignments_" + assignmentsCounter;
             logger.error(errorMsg);
             return ResponseEntity.internalServerError().body(errorMsg);
         }
diff --git a/src/main/java/eu/openaire/urls_worker/models/TarFileResult.java b/src/main/java/eu/openaire/urls_worker/models/TarFileResult.java
new file mode 100644
index 0000000..72d39c8
--- /dev/null
+++ b/src/main/java/eu/openaire/urls_worker/models/TarFileResult.java
@@ -0,0 +1,22 @@
+package eu.openaire.urls_worker.models;
+
+import java.io.File;
+
+public class TarFileResult {
+
+	private File tarFile;
+	private int numTarredFiles;
+
+	public TarFileResult(File tarFile, int numTarredFiles) {
+		this.tarFile = tarFile;
+		this.numTarredFiles = numTarredFiles;
+	}
+
+	public File getTarFile() {
+		return tarFile;
+	}
+
+	public int getNumTarredFiles() {
+		return numTarredFiles;
+	}
+}
diff --git a/src/main/java/eu/openaire/urls_worker/util/FilesCompressor.java b/src/main/java/eu/openaire/urls_worker/util/FilesCompressor.java
index 5eb9971..95e754d 100644
--- a/src/main/java/eu/openaire/urls_worker/util/FilesCompressor.java
+++ b/src/main/java/eu/openaire/urls_worker/util/FilesCompressor.java
@@ -1,6 +1,7 @@
 package eu.openaire.urls_worker.util;
 
 import eu.openaire.urls_worker.controllers.FullTextsController;
+import eu.openaire.urls_worker.models.TarFileResult;
 import org.apache.commons.compress.archivers.tar.TarArchiveEntry;
 import org.apache.commons.compress.archivers.tar.TarArchiveOutputStream;
 import org.apache.commons.compress.compressors.zstandard.ZstdCompressorOutputStream;
@@ -28,8 +29,11 @@ public class FilesCompressor {
     {
         // For example: assignments_2_full-texts_4.tar.zstd    | where < 4 > is referred to the 4th batch of files requested by the Controller.
         File tarFile;
+        int numTarredFiles = 0;
         try {
-            tarFile = getTarArchiveWithFullTexts(filesToCompress, baseDirectory, assignmentsCounter, tarBatchCounter);
+            TarFileResult tarFileResult = getTarArchiveWithFullTexts(filesToCompress, baseDirectory, assignmentsCounter, tarBatchCounter);
+            tarFile = tarFileResult.getTarFile();
+            numTarredFiles = tarFileResult.getNumTarredFiles();
         } catch (Exception e) {
             logger.error("Exception when creating the tar-file for assignments_" + assignmentsCounter, e);
             return null;
@@ -54,12 +58,15 @@ public class FilesCompressor {
                 zOut.write(readByte);
         } catch (Exception e) {
             logger.error("Exception when compressing the tar-archive: " + tarFilePath, e);
+            // The ".zstd" file may have been partially created. It will be deleted, along with this assignments' directory, by the caller.
             return null;
         } finally {
             FullTextsController.deleteFile(tarFilePath);
         }
 
-        logger.debug("Finished archiving and compressing the full-texts of assignments_" + assignmentsCounter + ", batch_" + tarBatchCounter);
+        // At this point, the compressed files are the exact files included inside the tar archive, so the possible "missing-files" case will already have arisen, previously.
+        int totalFiles = filesToCompress.size();
+        logger.debug("Finished archiving and compressing " + ((numTarredFiles == totalFiles) ? ("all " + totalFiles) : (numTarredFiles + " out of " + totalFiles)) + " full-texts of assignments_" + assignmentsCounter + ", batch_" + tarBatchCounter);
         return zStandardFile;
     }
 
@@ -67,7 +74,7 @@ public class FilesCompressor {
     /**
      * This method adds the requested full-text file into a TAR archive, which later will be compressed.
      * */
-    private static File getTarArchiveWithFullTexts(List<String> filesToTar, String baseDir, long assignmentsCounter, int tarBatchCounter) throws Exception
+    private static TarFileResult getTarArchiveWithFullTexts(List<String> filesToTar, String baseDir, long assignmentsCounter, int tarBatchCounter) throws Exception
     {
         String tarFileFullPath = baseDir + "assignments_" + assignmentsCounter + "_full-texts_" + tarBatchCounter + ".tar";
         // For example: assignments_2_full-texts_4.tar.zstd  |  where < 4 > is referred to the 4th batch of files requested by the Controller.
@@ -90,7 +97,7 @@ public class FilesCompressor {
             logger.warn("The number of \"numTarredFiles\" (" + numTarredFiles + ") is different from the number of files requested to be tarred (" + filesToTar.size() + "), for assignments_" + assignmentsCounter + ", batch_" + tarBatchCounter);
             // Still, some files may have been tarred, so we move on. It's up to the Controller, to handle such case.
 
-        return tarFile;
+        return new TarFileResult(tarFile, numTarredFiles);
     }