Add shortcut to backups guide

app/src/main/java/eu/kanade/tachiyomi/ui/setting/SettingsBackupController.kt

@@ -7,6 +7,9 @@ import android.content.ActivityNotFoundException
 import android.content.Intent
 import android.net.Uri
 import android.os.Bundle
+import android.view.Menu
+import android.view.MenuInflater
+import android.view.MenuItem
 import android.view.View
 import android.widget.Toast
 import androidx.appcompat.app.AlertDialog
@@ -37,6 +40,7 @@ import eu.kanade.tachiyomi.util.preference.preferenceCategory
 import eu.kanade.tachiyomi.util.preference.summaryRes
 import eu.kanade.tachiyomi.util.preference.titleRes
 import eu.kanade.tachiyomi.util.system.DeviceUtil
+import eu.kanade.tachiyomi.util.system.openInBrowser
 import eu.kanade.tachiyomi.util.system.toast
 import kotlinx.coroutines.flow.launchIn
 import kotlinx.coroutines.flow.onEach
@@ -158,6 +162,17 @@ class SettingsBackupController : SettingsController() {
         infoPreference(R.string.backup_info)
     }
 
+    override fun onCreateOptionsMenu(menu: Menu, inflater: MenuInflater) {
+        inflater.inflate(R.menu.settings_backup, menu)
+    }
+
+    override fun onOptionsItemSelected(item: MenuItem): Boolean {
+        when (item.itemId) {
+            R.id.action_backup_help -> activity?.openInBrowser(HELP_URL)
+        }
+        return super.onOptionsItemSelected(item)
+    }
+
     override fun onActivityResult(requestCode: Int, resultCode: Int, data: Intent?) {
         if (data != null && resultCode == Activity.RESULT_OK) {
             val activity = activity ?: return
@@ -305,3 +320,5 @@ private const val KEY_URI = "RestoreBackupDialog.uri"
 private const val CODE_BACKUP_DIR = 503
 private const val CODE_BACKUP_CREATE = 504
 private const val CODE_BACKUP_RESTORE = 505
+
+private const val HELP_URL = "https://tachiyomi.org/help/guides/backups/"

app/src/main/res/menu/settings_backup.xml

@@ -0,0 +1,11 @@
+<menu xmlns:android="http://schemas.android.com/apk/res/android"
+    xmlns:app="http://schemas.android.com/apk/res-auto">
+
+    <item
+        android:id="@+id/action_backup_help"
+        android:icon="@drawable/ic_help_24dp"
+        android:title="@string/label_help"
+        app:iconTint="?attr/colorOnSurface"
+        app:showAsAction="ifRoom" />
+
+</menu>