Index: oak-segment-azure/src/main/java/org/apache/jackrabbit/oak/segment/azure/tool/SegmentStoreMigrator.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- oak-segment-azure/src/main/java/org/apache/jackrabbit/oak/segment/azure/tool/SegmentStoreMigrator.java	(revision 3ca7adddb36fb894d4a482235baffce87c6fefb9)
+++ oak-segment-azure/src/main/java/org/apache/jackrabbit/oak/segment/azure/tool/SegmentStoreMigrator.java	(date 1604504533030)
@@ -155,6 +155,13 @@
         SegmentArchiveManager targetManager = target.createArchiveManager(false, false, new IOMonitorAdapter(),
                 new FileStoreMonitorAdapter(), new RemoteStoreMonitorAdapter());
         List<String> targetArchives = targetManager.listArchives();
+
+        if (appendMode && !targetArchives.isEmpty()) {
+            //last archive can be updated since last copy and needs to be recopied
+            String lastArchive = targetArchives.get(targetArchives.size() - 1);
+            targetArchives.remove(lastArchive);
+        }
+
         for (String archiveName : sourceManager.listArchives()) {
             log.info("{}/{} -> {}", sourceName, archiveName, targetName);
             if (appendMode && targetArchives.contains(archiveName)) {
Index: oak-segment-aws/src/main/java/org/apache/jackrabbit/oak/segment/aws/tool/AwsSegmentStoreMigrator.java
IDEA additional info:
Subsystem: com.intellij.openapi.diff.impl.patch.CharsetEP
<+>UTF-8
===================================================================
--- oak-segment-aws/src/main/java/org/apache/jackrabbit/oak/segment/aws/tool/AwsSegmentStoreMigrator.java	(revision 3ca7adddb36fb894d4a482235baffce87c6fefb9)
+++ oak-segment-aws/src/main/java/org/apache/jackrabbit/oak/segment/aws/tool/AwsSegmentStoreMigrator.java	(date 1606906872724)
@@ -153,6 +153,13 @@
         SegmentArchiveManager targetManager = target.createArchiveManager(false, false, new IOMonitorAdapter(),
                 new FileStoreMonitorAdapter(), new RemoteStoreMonitorAdapter());
         List<String> targetArchives = targetManager.listArchives();
+
+        if (appendMode && !targetArchives.isEmpty()) {
+            //last archive can be updated since last copy and needs to be recopied
+            String lastArchive = targetArchives.get(targetArchives.size() - 1);
+            targetArchives.remove(lastArchive);
+        }
+
         for (String archiveName : sourceManager.listArchives()) {
             log.info("{}/{} -> {}", sourceName, archiveName, targetName);
             if (appendMode && targetArchives.contains(archiveName)) {