diff --git a/src/ansys/dpf/core/core.py b/src/ansys/dpf/core/core.py
index 089fe71086a..a0433a6d958 100644
--- a/src/ansys/dpf/core/core.py
+++ b/src/ansys/dpf/core/core.py
@@ -292,7 +292,7 @@ def _deep_copy(dpf_entity, server=None):
     if stream_type == 1:
         out = serializer.get_output(0, types.bytes)
     else:
-        out = serializer.get_output(0, types.string)
+        out = serializer.outputs.serialized_string  # Required for retro with 241
     deserializer.connect(-1, stream_type)
     deserializer.connect(0, out)
     type_map = types_enum_to_types()
diff --git a/tests/conftest.py b/tests/conftest.py
index 84c6ce0e122..bd4afc54d66 100644
--- a/tests/conftest.py
+++ b/tests/conftest.py
@@ -260,6 +260,21 @@ def return_ds(server=None):
     return return_ds
 
 
+@pytest.fixture()
+def fluent_multiphase():
+    """Return a function which creates a data sources
+    with a cas and a dat file of fluent multiphase case."""
+
+    def return_ds(server=None):
+        ds = core.DataSources(server=server)
+        files = examples.download_fluent_multi_phase(server=server)
+        ds.set_result_file_path(files["cas"], "cas")
+        ds.add_file_path(files["dat"], "dat")
+        return ds
+
+    return return_ds
+
+
 @pytest.fixture()
 def cfx_heating_coil():
     """Return a function which creates a data sources
diff --git a/tests/test_field.py b/tests/test_field.py
index 56a525ecd6c..dacf0785c9e 100644
--- a/tests/test_field.py
+++ b/tests/test_field.py
@@ -1298,22 +1298,43 @@ def test_field_no_inprocess_localfield(server_in_process, allkindofcomplexity):
         assert field == local_field
 
 
-def test_deep_copy_2_field(server_type, server_in_process):
-    data = np.random.random(10)
-    field_a = dpf.core.field_from_array(data, server=server_type)
-    assert np.allclose(field_a.data, data)
+if SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_8_0:
+    def test_deep_copy_2_field(server_type, server_in_process):
+        data = np.random.random(10)
+        field_a = dpf.core.field_from_array(data, server=server_type)
+        assert np.allclose(field_a.data, data)
 
-    out = dpf.core.core._deep_copy(field_a, server_in_process)
-    assert np.allclose(out.data, data)
+        out = dpf.core.core._deep_copy(field_a, server_in_process)
+        assert np.allclose(out.data, data)
 
 
-def test_deep_copy_2_field_remote(server_type, server_type_remote_process):
-    data = np.random.random(10)
-    field_a = dpf.core.field_from_array(data, server=server_type)
-    assert np.allclose(field_a.data, data)
+    def test_deep_copy_2_field_remote(server_type, server_type_remote_process):
+        data = np.random.random(10)
+        field_a = dpf.core.field_from_array(data, server=server_type)
+        assert np.allclose(field_a.data, data)
 
-    out = dpf.core.core._deep_copy(field_a, server_type_remote_process)
-    assert np.allclose(out.data, data)
+        out = dpf.core.core._deep_copy(field_a, server_type_remote_process)
+        assert np.allclose(out.data, data)
+
+elif conftest.SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_6_0:
+    # before server version 8.0 deep copying between a legacy grpc client and another client type
+    # is not supported.
+    def test_deep_copy_2_field(server_clayer, server_in_process):
+        data = np.random.random(10)
+        field_a = dpf.core.field_from_array(data, server=server_clayer)
+        assert np.allclose(field_a.data, data)
+
+        out = dpf.core.core._deep_copy(field_a, server_in_process)
+        assert np.allclose(out.data, data)
+
+
+    def test_deep_copy_2_field_remote(server_type):
+        data = np.random.random(10)
+        field_a = dpf.core.field_from_array(data, server=server_type)
+        assert np.allclose(field_a.data, data)
+
+        out = dpf.core.core._deep_copy(field_a, server_type)
+        assert np.allclose(out.data, data)
 
 
 @pytest.mark.skipif(not SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_8_0, reason="Available for servers >=8.0")
diff --git a/tests/test_meshregion.py b/tests/test_meshregion.py
index 4bb6b6e7501..62fdfd99053 100644
--- a/tests/test_meshregion.py
+++ b/tests/test_meshregion.py
@@ -547,6 +547,7 @@ def test_has_element_shape_meshed_region(server_type):
 
 @pytest.mark.slow
 def test_mesh_deep_copy(allkindofcomplexity, server_type):
+    # Small mesh
     model = dpf.core.Model(allkindofcomplexity, server=server_type)
     mesh = model.metadata.meshed_region
     copy = mesh.deep_copy()
@@ -575,6 +576,16 @@ def test_mesh_deep_copy(allkindofcomplexity, server_type):
     )
 
 
+@pytest.mark.skipif(
+    not conftest.SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_7_0, reason="Available with CFF starting 7.0"
+)
+def test_mesh_deep_copy_large(fluent_multiphase, server_type):
+    model = dpf.core.Model(fluent_multiphase(server=server_type), server=server_type)
+    mesh = model.metadata.meshed_region
+    copy = mesh.deep_copy()
+    assert np.allclose(copy.nodes.scoping.ids, mesh.nodes.scoping.ids)
+
+
 @pytest.mark.slow
 def test_mesh_deep_copy2(simple_bar_model, server_type):
     mesh = simple_bar_model.metadata.meshed_region
diff --git a/tests/test_operator.py b/tests/test_operator.py
index 0c45d47ca67..3ebdeb7a183 100644
--- a/tests/test_operator.py
+++ b/tests/test_operator.py
@@ -19,6 +19,7 @@
     SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_4_0,
     SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_5_0,
     SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_6_2,
+    SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_8_0,
 )
 
 # Check for ANSYS installation env var
@@ -1337,6 +1338,7 @@ def test_connect_get_non_ascii_string(server_type):
     assert str == str_out
 
 
+@pytest.mark.skipif(not SERVERS_VERSION_GREATER_THAN_OR_EQUAL_TO_8_0, reason="Available for servers >=8.0")
 def test_deep_copy_non_ascii_string(server_type):
     str = "\N{GREEK CAPITAL LETTER DELTA}"
     str_out = dpf.core.core._deep_copy(str, server_type)