Apply backup feature flag.

Signal/src/util/Backup/OWSBackup.h

@@ -79,8 +79,6 @@ NSError *OWSBackupErrorWithDescription(NSString *description);
 
 - (AnyPromise *)ensureCloudKitAccess;
 
-- (AnyPromise *)checkCanExportBackup;
-
 - (void)checkCanImportBackup:(OWSBackupBoolBlock)success failure:(OWSBackupErrorBlock)failure;
 
 // TODO: After a successful import, we should enable backup and

Signal/src/util/Backup/OWSBackup.m

@@ -433,11 +433,6 @@ NSError *OWSBackupErrorWithDescription(NSString *description)
         }];
 }
 
-- (AnyPromise *)checkCanExportBackup
-{
-    return [self ensureCloudKitAccess];
-}
-
 - (AnyPromise *)ensureCloudKitAccess
 {
     OWSAssertIsOnMainThread();
@@ -473,6 +468,13 @@ NSError *OWSBackupErrorWithDescription(NSString *description)
 
     OWSLogInfo(@"");
 
+    if (!OWSBackup.isFeatureEnabled) {
+        dispatch_async(dispatch_get_main_queue(), ^{
+            success(NO);
+        });
+        return;
+    }
+
     void (^failWithUnexpectedError)(void) = ^{
         dispatch_async(dispatch_get_main_queue(), ^{
             NSError *error =