diff --git a/src/hdf5_time_series_storage.jl b/src/hdf5_time_series_storage.jl
index 1ce754877..60b3a2858 100644
--- a/src/hdf5_time_series_storage.jl
+++ b/src/hdf5_time_series_storage.jl
@@ -99,6 +99,27 @@ function from_file(
     return storage
 end
 
+"""
+Copy the time series data to a new file. This should get called when the system is
+undergoing a deepcopy.
+
+# Arguments
+- `storage::Hdf5TimeSeriesStorage`: storage instance
+- `directory::String`: If nothing, use tempdir
+"""
+function copy_to_new_file!(storage::Hdf5TimeSeriesStorage, directory = nothing)
+    if directory === nothing
+        directory = tempdir()
+    end
+
+    # If we ever choose to keep the HDF5 file open then this will break.
+    # Any open buffers will need to be flushed.
+    filename, io = mktemp(directory)
+    close(io)
+    copy_file(get_file_path(storage), filename)
+    storage.file_path = filename
+end
+
 get_compression_settings(storage::Hdf5TimeSeriesStorage) = storage.compression
 
 get_file_path(storage::Hdf5TimeSeriesStorage) = storage.file_path
diff --git a/src/in_memory_time_series_storage.jl b/src/in_memory_time_series_storage.jl
index e733c32b7..65aa97fc3 100644
--- a/src/in_memory_time_series_storage.jl
+++ b/src/in_memory_time_series_storage.jl
@@ -211,11 +211,11 @@ function compare_values(x::InMemoryTimeSeriesStorage, y::InMemoryTimeSeriesStora
             @error "component_names don't match" record_x.component_names record_y.component_names
             return false
         end
-        if TimeSeries.timestamp(record_x.ta.data) != TimeSeries.timestamp(record_y.ta.data)
+        if TimeSeries.timestamp(record_x.ts.data) != TimeSeries.timestamp(record_y.ts.data)
             @error "timestamps don't match" record_x record_y
             return false
         end
-        if TimeSeries.values(record_x.ta.data) != TimeSeries.values(record_y.ta.data)
+        if TimeSeries.values(record_x.ts.data) != TimeSeries.values(record_y.ts.data)
             @error "values don't match" record_x record_y
             return false
         end
diff --git a/test/test_time_series.jl b/test/test_time_series.jl
index 07331c07a..9aa1646df 100644
--- a/test/test_time_series.jl
+++ b/test/test_time_series.jl
@@ -1985,3 +1985,32 @@ end
         count = 3,
     )
 end
+
+@testset "Test copy_to_new_file! on HDF5" begin
+    sys = IS.SystemData(time_series_in_memory = false)
+    name = "Component1"
+    name = "val"
+    component = IS.TestComponent(name, 5)
+    IS.add_component!(sys, component)
+
+    initial_timestamp = Dates.DateTime("2020-01-01T00:00:00")
+    horizon = 24
+    resolution = Dates.Hour(1)
+    data_input = rand(horizon)
+    data = SortedDict(initial_timestamp => data_input)
+    time_series = IS.Deterministic(name = name, resolution = resolution, data = data)
+    fdata = IS.get_data(time_series)
+    @test initial_timestamp == first(keys((fdata)))
+    @test data_input == first(values((fdata)))
+
+    IS.add_time_series!(sys, component, time_series)
+    orig_file = IS.get_file_path(sys.time_series_storage)
+    IS.copy_to_new_file!(sys.time_series_storage)
+    @test orig_file != IS.get_file_path(sys.time_series_storage)
+
+    time_series2 = IS.get_time_series(IS.Deterministic, component, name)
+    @test time_series2 isa IS.Deterministic
+    fdata2 = IS.get_data(time_series2)
+    @test initial_timestamp == first(keys((fdata2)))
+    @test data_input == first(values((fdata2)))
+end