diff --git a/app/src/main/java/io/legado/app/help/CrashHandler.kt b/app/src/main/java/io/legado/app/help/CrashHandler.kt
index f597bb846..b59609e18 100644
--- a/app/src/main/java/io/legado/app/help/CrashHandler.kt
+++ b/app/src/main/java/io/legado/app/help/CrashHandler.kt
@@ -14,6 +14,7 @@ import java.io.PrintWriter
 import java.io.StringWriter
 import java.text.SimpleDateFormat
 import java.util.*
+import java.util.concurrent.TimeUnit
 
 /**
  * 异常管理类
@@ -140,8 +141,13 @@ class CrashHandler : Thread.UncaughtExceptionHandler {
             val timestamp = System.currentTimeMillis()
             val time = format.format(Date())
             val fileName = "crash-$time-$timestamp.log"
-            mContext?.externalCacheDir?.let {
-                FileUtils.createFileIfNotExist(it, fileName, "crash")
+            mContext?.externalCacheDir?.let { rootFile ->
+                FileUtils.getDirFile(rootFile, "crash").listFiles()?.forEach {
+                    if (it.lastModified() < System.currentTimeMillis() - TimeUnit.DAYS.toMillis(7)) {
+                        it.delete()
+                    }
+                }
+                FileUtils.createFileIfNotExist(rootFile, fileName, "crash")
                     .writeText(sb.toString())
             }
         }
diff --git a/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt b/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
index 0843dbb5d..a1386f9f7 100644
--- a/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
+++ b/app/src/main/java/io/legado/app/help/storage/WebDavHelp.kt
@@ -23,10 +23,7 @@ import kotlin.math.min
 
 object WebDavHelp {
     private const val defaultWebDavUrl = "https://dav.jianguoyun.com/dav/"
-    private val zipFilePath = FileUtils.getCachePath() + "/backup" + ".zip"
-    private val unzipFilesPath by lazy {
-        FileUtils.getCachePath()
-    }
+    private val zipFilePath = "${FileUtils.getCachePath()}${File.separator}backup.zip"
 
     private fun getWebDavUrl(): String {
         var url = App.INSTANCE.getPrefString(PreferKey.webDavUrl)
@@ -88,8 +85,8 @@ object WebDavHelp {
                 val file = WebDav(it + "legado/" + name)
                 file.downloadTo(zipFilePath, true)
                 @Suppress("BlockingMethodInNonBlockingContext")
-                ZipUtils.unzipFile(zipFilePath, unzipFilesPath)
-                Restore.restore(unzipFilesPath)
+                ZipUtils.unzipFile(zipFilePath, Backup.backupPath)
+                Restore.restore(Backup.backupPath)
             }
         }.onSuccess {
             success.invoke()
diff --git a/app/src/main/java/io/legado/app/utils/FileUtils.kt b/app/src/main/java/io/legado/app/utils/FileUtils.kt
index 2b4cbce61..59b5c4d24 100644
--- a/app/src/main/java/io/legado/app/utils/FileUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/FileUtils.kt
@@ -54,8 +54,13 @@ object FileUtils {
         return file
     }
 
-    fun getFile(file: File, fileName: String, vararg subDirs: String): File {
-        val filePath = getPath(file, fileName, *subDirs)
+    fun getFile(root: File, fileName: String, vararg subDirs: String): File {
+        val filePath = getPath(root, fileName, *subDirs)
+        return File(filePath)
+    }
+
+    fun getDirFile(root: File, vararg subDirs: String): File {
+        val filePath = getPath(root, subDirs = *subDirs)
         return File(filePath)
     }
 
diff --git a/app/src/main/java/io/legado/app/utils/LogUtils.kt b/app/src/main/java/io/legado/app/utils/LogUtils.kt
index 8c5070d11..e70813dee 100644
--- a/app/src/main/java/io/legado/app/utils/LogUtils.kt
+++ b/app/src/main/java/io/legado/app/utils/LogUtils.kt
@@ -2,7 +2,6 @@ package io.legado.app.utils
 
 import android.annotation.SuppressLint
 import io.legado.app.App
-import java.io.File
 import java.text.SimpleDateFormat
 import java.util.*
 import java.util.logging.*
@@ -24,18 +23,17 @@ object LogUtils {
 
     private val logger: Logger by lazy {
         Logger.getGlobal().apply {
-            addHandler(fileHandler)
+            fileHandler?.let {
+                addHandler(it)
+            }
         }
     }
 
     private val fileHandler by lazy {
-        val logFolder = FileUtils.getCachePath() + File.separator + "logs"
-        FileUtils.createFolderIfNotExist(logFolder)
-        FileHandler(
-            logFolder + File.separator + "app.log",
-            10240,
-            10
-        ).apply {
+        val root = App.INSTANCE.externalCacheDir ?: return@lazy null
+        val logFolder = FileUtils.createFolderIfNotExist(root, "logs")
+        val logPath = FileUtils.getPath(logFolder, "appLog")
+        FileHandler(logPath, 10240, 10).apply {
             formatter = object : Formatter() {
                 override fun format(record: LogRecord): String {
                     // 设置文件输出格式
@@ -51,7 +49,7 @@ object LogUtils {
     }
 
     fun upLevel() {
-        fileHandler.level = if (App.INSTANCE.getPrefBoolean("recordLog")) {
+        fileHandler?.level = if (App.INSTANCE.getPrefBoolean("recordLog")) {
             Level.INFO
         } else {
             Level.OFF