Use scheduler.is_running()

src/imex.rs

@@ -750,7 +750,7 @@ where
 /// This also verifies that IO is not running during the export.
 async fn export_database(context: &Context, dest: &Path, passphrase: String) -> Result<()> {
     ensure!(
-        context.scheduler.read().await.is_none(),
+        !context.scheduler.is_running().await,
         "cannot export backup, IO is running"
     );
     let now = time().try_into().context("32-bit UNIX time overflow")?;

src/imex/transfer.rs

@@ -374,7 +374,7 @@ pub async fn get_backup(context: &Context, qr: Qr) -> Result<()> {
         "Cannot import backups to accounts in use."
     );
     ensure!(
-        context.scheduler.read().await.is_none(),
+        !context.scheduler.is_running().await,
         "cannot import backup, IO is running"
     );