diff --git a/app/src/main/java/io/legado/app/data/dao/BookGroupDao.kt b/app/src/main/java/io/legado/app/data/dao/BookGroupDao.kt
index 5e1fe7684..4ce64c2e0 100644
--- a/app/src/main/java/io/legado/app/data/dao/BookGroupDao.kt
+++ b/app/src/main/java/io/legado/app/data/dao/BookGroupDao.kt
@@ -58,6 +58,9 @@ interface BookGroupDao {
     @get:Query("SELECT * FROM book_groups ORDER BY `order`")
     val all: List<BookGroup>
 
+    @get:Query("select count(*) < 64 from book_groups where groupId >= 0 or groupId == ${Long.MIN_VALUE}")
+    val canAddGroup: Boolean
+
     @Query("update book_groups set show = 1 where groupId = :groupId")
     fun enableGroup(groupId: Long)
 
diff --git a/app/src/main/java/io/legado/app/help/TTS.kt b/app/src/main/java/io/legado/app/help/TTS.kt
index 6774638ff..3165bb3e8 100644
--- a/app/src/main/java/io/legado/app/help/TTS.kt
+++ b/app/src/main/java/io/legado/app/help/TTS.kt
@@ -77,24 +77,23 @@ class TTS {
     }
 
     private fun addTextToSpeakList() {
-        textToSpeech?.let { tts ->
-            kotlin.runCatching {
-                var result = tts.speak("", TextToSpeech.QUEUE_FLUSH, null, null)
-                if (result == TextToSpeech.ERROR) {
-                    clearTts()
-                    textToSpeech = TextToSpeech(appCtx, initListener)
-                    return
-                }
-                text?.splitNotBlank("\n")?.forEachIndexed { i, s ->
-                    result = tts.speak(s, TextToSpeech.QUEUE_ADD, null, tag + i)
-                    if (result == TextToSpeech.ERROR) {
-                        AppLog.put("tts朗读出错:$text")
-                    }
-                }
-            }.onFailure {
-                AppLog.put("tts朗读出错", it)
-                appCtx.toastOnUi(it.localizedMessage)
+        val tts = textToSpeech ?: return
+        kotlin.runCatching {
+            var result = tts.speak("", TextToSpeech.QUEUE_FLUSH, null, null)
+            if (result == TextToSpeech.ERROR) {
+                clearTts()
+                textToSpeech = TextToSpeech(appCtx, initListener)
+                return
             }
+            text?.splitNotBlank("\n")?.forEachIndexed { i, s ->
+                result = tts.speak(s, TextToSpeech.QUEUE_ADD, null, tag + i)
+                if (result == TextToSpeech.ERROR) {
+                    AppLog.put("tts朗读出错:$text")
+                }
+            }
+        }.onFailure {
+            AppLog.put("tts朗读出错", it)
+            appCtx.toastOnUi(it.localizedMessage)
         }
     }
 
diff --git a/app/src/main/java/io/legado/app/help/storage/Backup.kt b/app/src/main/java/io/legado/app/help/storage/Backup.kt
index 6470c06f1..4403d4f2f 100644
--- a/app/src/main/java/io/legado/app/help/storage/Backup.kt
+++ b/app/src/main/java/io/legado/app/help/storage/Backup.kt
@@ -6,6 +6,7 @@ import androidx.documentfile.provider.DocumentFile
 import io.legado.app.constant.AppLog
 import io.legado.app.constant.PreferKey
 import io.legado.app.data.appDb
+import io.legado.app.exception.NoStackTraceException
 import io.legado.app.help.AppWebDav
 import io.legado.app.help.DirectLinkUpload
 import io.legado.app.help.config.AppConfig
@@ -186,6 +187,7 @@ object Backup {
                 }
                 AppWebDav.backUpWebDav(zipFileName)
             }
+            FileUtils.delete(backupPath)
         }
     }
 
@@ -203,12 +205,15 @@ object Backup {
     @Throws(Exception::class)
     @Suppress("SameParameterValue")
     private fun copyBackup(context: Context, uri: Uri, fileName: String) {
-        DocumentFile.fromTreeUri(context, uri)?.let { treeDoc ->
-            treeDoc.findFile(fileName)?.delete()
-            treeDoc.createFile("", fileName)?.openOutputStream()?.use { outputS ->
-                FileInputStream(File(zipFilePath)).use { inputS ->
-                    inputS.copyTo(outputS)
-                }
+        val treeDoc = DocumentFile.fromTreeUri(context, uri)!!
+        treeDoc.findFile(fileName)?.delete()
+        val fileDoc = treeDoc.createFile("", fileName)
+            ?: throw NoStackTraceException("创建文件失败")
+        val outputS = fileDoc.openOutputStream()
+            ?: throw NoStackTraceException("打开OutputStream失败")
+        outputS.use {
+            FileInputStream(zipFilePath).use { inputS ->
+                inputS.copyTo(outputS)
             }
         }
     }
diff --git a/app/src/main/java/io/legado/app/ui/book/group/GroupManageDialog.kt b/app/src/main/java/io/legado/app/ui/book/group/GroupManageDialog.kt
index 4f9775886..2347f7015 100644
--- a/app/src/main/java/io/legado/app/ui/book/group/GroupManageDialog.kt
+++ b/app/src/main/java/io/legado/app/ui/book/group/GroupManageDialog.kt
@@ -26,6 +26,7 @@ import io.legado.app.ui.widget.recycler.VerticalDivider
 import io.legado.app.utils.applyTint
 import io.legado.app.utils.setLayout
 import io.legado.app.utils.showDialogFragment
+import io.legado.app.utils.toastOnUi
 import io.legado.app.utils.viewbindingdelegate.viewBinding
 import io.legado.app.utils.visible
 import kotlinx.coroutines.flow.conflate
@@ -82,7 +83,13 @@ class GroupManageDialog : BaseDialogFragment(R.layout.dialog_recycler_view),
 
     override fun onMenuItemClick(item: MenuItem?): Boolean {
         when (item?.itemId) {
-            R.id.menu_add -> showDialogFragment(GroupEditDialog())
+            R.id.menu_add -> {
+                if (appDb.bookGroupDao.canAddGroup) {
+                    showDialogFragment(GroupEditDialog())
+                } else {
+                    toastOnUi("分组已达上限(64个)")
+                }
+            }
         }
         return true
     }