diff --git a/duplicacy/duplicacy_main.go b/duplicacy/duplicacy_main.go
index c54cf8c..719ea48 100644
--- a/duplicacy/duplicacy_main.go
+++ b/duplicacy/duplicacy_main.go
@@ -513,6 +513,8 @@ func setPreference(context *cli.Context) {
 	if triBool.IsSet() {
 		newPreference.DoNotSavePassword = triBool.IsTrue()
 	}
+	
+	newPreference.NobackupFile = context.String("nobackup-file")
 
 	key := context.String("key")
 	value := context.String("value")
@@ -694,7 +696,7 @@ func backupRepository(context *cli.Context) {
 	dryRun := context.Bool("dry-run")
 	uploadRateLimit := context.Int("limit-rate")
 	storage.SetRateLimits(0, uploadRateLimit)
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -783,7 +785,7 @@ func restoreRepository(context *cli.Context) {
 	duplicacy.LOG_DEBUG("REGEX_DEBUG", "There are %d compiled regular expressions stored", len(duplicacy.RegexMap))
 
 	storage.SetRateLimits(context.Int("limit-rate"), 0)
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -823,7 +825,7 @@ func listSnapshots(context *cli.Context) {
 	tag := context.String("t")
 	revisions := getRevisions(context)
 
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	id := preference.SnapshotID
@@ -871,7 +873,7 @@ func checkSnapshots(context *cli.Context) {
 	tag := context.String("t")
 	revisions := getRevisions(context)
 
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	id := preference.SnapshotID
@@ -926,7 +928,7 @@ func printFile(context *cli.Context) {
 		snapshotID = context.String("id")
 	}
 
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -982,11 +984,11 @@ func diff(context *cli.Context) {
 	}
 
 	compareByHash := context.Bool("hash")
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
-	backupManager.SnapshotManager.Diff(repository, snapshotID, revisions, path, compareByHash)
+	backupManager.SnapshotManager.Diff(repository, snapshotID, revisions, path, compareByHash, preference.NobackupFile)
 
 	runScript(context, preference.Name, "post")
 }
@@ -1025,7 +1027,7 @@ func showHistory(context *cli.Context) {
 
 	revisions := getRevisions(context)
 	showLocalHash := context.Bool("hash")
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -1083,7 +1085,7 @@ func pruneSnapshots(context *cli.Context) {
 		os.Exit(ArgumentExitCode)
 	}
 
-	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password)
+	backupManager := duplicacy.CreateBackupManager(preference.SnapshotID, storage, repository, password, preference.NobackupFile)
 	duplicacy.SavePassword(*preference, "password", password)
 
 	backupManager.SetupSnapshotCache(preference.Name)
@@ -1123,7 +1125,7 @@ func copySnapshots(context *cli.Context) {
 		sourcePassword = duplicacy.GetPassword(*source, "password", "Enter source storage password:", false, false)
 	}
 
-	sourceManager := duplicacy.CreateBackupManager(source.SnapshotID, sourceStorage, repository, sourcePassword)
+	sourceManager := duplicacy.CreateBackupManager(source.SnapshotID, sourceStorage, repository, sourcePassword, source.NobackupFile)
 	sourceManager.SetupSnapshotCache(source.Name)
 	duplicacy.SavePassword(*source, "password", sourcePassword)
 
@@ -1156,7 +1158,7 @@ func copySnapshots(context *cli.Context) {
 	destinationStorage.SetRateLimits(0, context.Int("upload-limit-rate"))
 
 	destinationManager := duplicacy.CreateBackupManager(destination.SnapshotID, destinationStorage, repository,
-		destinationPassword)
+		destinationPassword, destination.NobackupFile)
 	duplicacy.SavePassword(*destination, "password", destinationPassword)
 	destinationManager.SetupSnapshotCache(destination.Name)
 
@@ -1722,6 +1724,12 @@ func main() {
 					Value: &TriBool{},
 					Arg:   "true",
 				},
+				cli.StringFlag{
+					Name:  "nobackup-file",
+					Usage: "Directories containing a file with this name will not be backed up",
+					Argument: "<file name>",
+					Value:   "",
+				},
 				cli.StringFlag{
 					Name:  "key",
 					Usage: "add a key/password whose value is supplied by the -value option",
diff --git a/src/duplicacy_backupmanager.go b/src/duplicacy_backupmanager.go
index b8a59bc..2671c19 100644
--- a/src/duplicacy_backupmanager.go
+++ b/src/duplicacy_backupmanager.go
@@ -33,6 +33,8 @@ type BackupManager struct {
 	snapshotCache   *FileStorage     // for copies of chunks needed by snapshots
 
 	config *Config // contains a number of options
+	
+	nobackupFile string // don't backup directory when this file name is found
 }
 
 func (manager *BackupManager) SetDryRun(dryRun bool) {
@@ -42,7 +44,7 @@ func (manager *BackupManager) SetDryRun(dryRun bool) {
 // CreateBackupManager creates a backup manager using the specified 'storage'.  'snapshotID' is a unique id to
 // identify snapshots created for this repository.  'top' is the top directory of the repository.  'password' is the
 // master key which can be nil if encryption is not enabled.
-func CreateBackupManager(snapshotID string, storage Storage, top string, password string) *BackupManager {
+func CreateBackupManager(snapshotID string, storage Storage, top string, password string, nobackupFile string) *BackupManager {
 
 	config, _, err := DownloadConfig(storage, password)
 	if err != nil {
@@ -63,6 +65,8 @@ func CreateBackupManager(snapshotID string, storage Storage, top string, passwor
 		SnapshotManager: snapshotManager,
 
 		config: config,
+		
+		nobackupFile: nobackupFile,
 	}
 
 	if IsDebugging() {
@@ -184,7 +188,7 @@ func (manager *BackupManager) Backup(top string, quickMode bool, threads int, ta
 	defer DeleteShadowCopy()
 
 	LOG_INFO("BACKUP_INDEXING", "Indexing %s", top)
-	localSnapshot, skippedDirectories, skippedFiles, err := CreateSnapshotFromDirectory(manager.snapshotID, shadowTop)
+	localSnapshot, skippedDirectories, skippedFiles, err := CreateSnapshotFromDirectory(manager.snapshotID, shadowTop, manager.nobackupFile)
 	if err != nil {
 		LOG_ERROR("SNAPSHOT_LIST", "Failed to list the directory %s: %v", top, err)
 		return false
@@ -752,7 +756,7 @@ func (manager *BackupManager) Restore(top string, revision int, inPlace bool, qu
 	remoteSnapshot := manager.SnapshotManager.DownloadSnapshot(manager.snapshotID, revision)
 	manager.SnapshotManager.DownloadSnapshotContents(remoteSnapshot, patterns, true)
 
-	localSnapshot, _, _, err := CreateSnapshotFromDirectory(manager.snapshotID, top)
+	localSnapshot, _, _, err := CreateSnapshotFromDirectory(manager.snapshotID, top, manager.nobackupFile)
 	if err != nil {
 		LOG_ERROR("SNAPSHOT_LIST", "Failed to list the repository: %v", err)
 		return false
diff --git a/src/duplicacy_backupmanager_test.go b/src/duplicacy_backupmanager_test.go
index e463e93..80b6ecc 100644
--- a/src/duplicacy_backupmanager_test.go
+++ b/src/duplicacy_backupmanager_test.go
@@ -239,7 +239,7 @@ func TestBackupManager(t *testing.T) {
 	time.Sleep(time.Duration(delay) * time.Second)
 
 	SetDuplicacyPreferencePath(testDir + "/repository1/.duplicacy")
-	backupManager := CreateBackupManager("host1", storage, testDir, password)
+	backupManager := CreateBackupManager("host1", storage, testDir, password, "")
 	backupManager.SetupSnapshotCache("default")
 
 	SetDuplicacyPreferencePath(testDir + "/repository1/.duplicacy")
diff --git a/src/duplicacy_entry.go b/src/duplicacy_entry.go
index 6287fa7..bc6ab47 100644
--- a/src/duplicacy_entry.go
+++ b/src/duplicacy_entry.go
@@ -435,7 +435,7 @@ func (files FileInfoCompare) Less(i, j int) bool {
 
 // ListEntries returns a list of entries representing file and subdirectories under the directory 'path'.  Entry paths
 // are normalized as relative to 'top'.  'patterns' are used to exclude or include certain files.
-func ListEntries(top string, path string, fileList *[]*Entry, patterns []string, discardAttributes bool) (directoryList []*Entry,
+func ListEntries(top string, path string, fileList *[]*Entry, patterns []string, nobackupFile string, discardAttributes bool) (directoryList []*Entry,
 	skippedFiles []string, err error) {
 
 	LOG_DEBUG("LIST_ENTRIES", "Listing %s", path)
@@ -448,6 +448,15 @@ func ListEntries(top string, path string, fileList *[]*Entry, patterns []string,
 	if err != nil {
 		return directoryList, nil, err
 	}
+	
+	// This binary search works because ioutil.ReadDir returns files sorted by Name() by default
+	if nobackupFile != "" {
+		ii := sort.Search(len(files), func(ii int) bool { return strings.Compare(files[ii].Name(), nobackupFile) >= 0})
+		if ii < len(files) && files[ii].Name() == nobackupFile {
+			LOG_DEBUG("LIST_NOBACKUP", "%s is excluded due to nobackup file", path)
+			return directoryList, skippedFiles, nil
+		}
+	}
 
 	normalizedPath := path
 	if len(normalizedPath) > 0 && normalizedPath[len(normalizedPath)-1] != '/' {
diff --git a/src/duplicacy_entry_test.go b/src/duplicacy_entry_test.go
index a3d38fc..d809412 100644
--- a/src/duplicacy_entry_test.go
+++ b/src/duplicacy_entry_test.go
@@ -173,7 +173,7 @@ func TestEntryList(t *testing.T) {
 		directory := directories[len(directories)-1]
 		directories = directories[:len(directories)-1]
 		entries = append(entries, directory)
-		subdirectories, _, err := ListEntries(testDir, directory.Path, &entries, nil, false)
+		subdirectories, _, err := ListEntries(testDir, directory.Path, &entries, nil, "", false)
 		if err != nil {
 			t.Errorf("ListEntries(%s, %s) returned an error: %s", testDir, directory.Path, err)
 		}
diff --git a/src/duplicacy_preference.go b/src/duplicacy_preference.go
index f9eaeb1..ff4b271 100644
--- a/src/duplicacy_preference.go
+++ b/src/duplicacy_preference.go
@@ -22,6 +22,7 @@ type Preference struct {
 	BackupProhibited  bool              `json:"no_backup"`
 	RestoreProhibited bool              `json:"no_restore"`
 	DoNotSavePassword bool              `json:"no_save_password"`
+	NobackupFile      string            `json:"nobackup_file"`
 	Keys              map[string]string `json:"keys"`
 }
 
diff --git a/src/duplicacy_snapshot.go b/src/duplicacy_snapshot.go
index 3a41197..3355dc4 100644
--- a/src/duplicacy_snapshot.go
+++ b/src/duplicacy_snapshot.go
@@ -57,7 +57,7 @@ func CreateEmptySnapshot(id string) (snapshto *Snapshot) {
 
 // CreateSnapshotFromDirectory creates a snapshot from the local directory 'top'.  Only 'Files'
 // will be constructed, while 'ChunkHashes' and 'ChunkLengths' can only be populated after uploading.
-func CreateSnapshotFromDirectory(id string, top string) (snapshot *Snapshot, skippedDirectories []string,
+func CreateSnapshotFromDirectory(id string, top string, nobackupFile string) (snapshot *Snapshot, skippedDirectories []string,
 	skippedFiles []string, err error) {
 
 	snapshot = &Snapshot{
@@ -125,7 +125,7 @@ func CreateSnapshotFromDirectory(id string, top string) (snapshot *Snapshot, ski
 		directory := directories[len(directories)-1]
 		directories = directories[:len(directories)-1]
 		snapshot.Files = append(snapshot.Files, directory)
-		subdirectories, skipped, err := ListEntries(top, directory.Path, &snapshot.Files, patterns, snapshot.discardAttributes)
+		subdirectories, skipped, err := ListEntries(top, directory.Path, &snapshot.Files, patterns, nobackupFile, snapshot.discardAttributes)
 		if err != nil {
 			LOG_WARN("LIST_FAILURE", "Failed to list subdirectory: %v", err)
 			skippedDirectories = append(skippedDirectories, directory.Path)
diff --git a/src/duplicacy_snapshotmanager.go b/src/duplicacy_snapshotmanager.go
index 289237d..0f873be 100644
--- a/src/duplicacy_snapshotmanager.go
+++ b/src/duplicacy_snapshotmanager.go
@@ -1240,7 +1240,7 @@ func (manager *SnapshotManager) PrintFile(snapshotID string, revision int, path
 
 // Diff compares two snapshots, or two revision of a file if the file argument is given.
 func (manager *SnapshotManager) Diff(top string, snapshotID string, revisions []int,
-	filePath string, compareByHash bool) bool {
+	filePath string, compareByHash bool, nobackupFile string) bool {
 
 	LOG_DEBUG("DIFF_PARAMETERS", "top: %s, id: %s, revision: %v, path: %s, compareByHash: %t",
 		top, snapshotID, revisions, filePath, compareByHash)
@@ -1253,7 +1253,7 @@ func (manager *SnapshotManager) Diff(top string, snapshotID string, revisions []
 	if len(revisions) <= 1 {
 		// Only scan the repository if filePath is not provided
 		if len(filePath) == 0 {
-			rightSnapshot, _, _, err = CreateSnapshotFromDirectory(snapshotID, top)
+			rightSnapshot, _, _, err = CreateSnapshotFromDirectory(snapshotID, top, nobackupFile)
 			if err != nil {
 				LOG_ERROR("SNAPSHOT_LIST", "Failed to list the directory %s: %v", top, err)
 				return false