diff --git a/tools/donate-cpu-server.py b/tools/donate-cpu-server.py
index 9256d93049f..b35cd3da702 100755
--- a/tools/donate-cpu-server.py
+++ b/tools/donate-cpu-server.py
@@ -1254,9 +1254,8 @@ def read_data(connection, cmd, pos_nl, max_data_size, check_done, cmd_name, time
 
     if data and (len(data) >= max_data_size):
         print_ts('Maximum allowed data ({} bytes) exceeded ({}).'.format(max_data_size, cmd_name))
-        data = None
 
-    if data and check_done and not data.endswith('\nDONE'):
+    elif data and check_done and not data.endswith('\nDONE'):
         print_ts('Incomplete data received ({}).'.format(cmd_name))
         data = None
 
@@ -1334,9 +1333,10 @@ def server(server_address_port: int, packages: list, packageIndex: int, resultPa
             continue
         elif cmd.startswith('write\nftp://') or cmd.startswith('write\nhttp://'):
             t_start = time.perf_counter()
-            data = read_data(connection, cmd, pos_nl, max_data_size=10 * 1024 * 1024, check_done=True, cmd_name='write')
+            data = read_data(connection, cmd, pos_nl, max_data_size=1024 * 1024, check_done=True, cmd_name='write')
             if data is None:
                 continue
+            truncated_data = len(data) >= 1024 * 1024
 
             pos = data.find('\n')
             if pos == -1:
@@ -1376,6 +1376,10 @@ def server(server_address_port: int, packages: list, packageIndex: int, resultPa
                 print_ts('Unexpected old version. Ignoring result data.')
                 continue
             filename = os.path.join(resultPath, res.group(1))
+            if truncated_data:
+                print_ts('Data is too large. Removing result.')
+                os.remove(filename)
+                continue
             with open(filename, 'wt') as f:
                 f.write(strDateTime() + '\n' + data)
             # track latest added results..
@@ -1393,6 +1397,7 @@ def server(server_address_port: int, packages: list, packageIndex: int, resultPa
             data = read_data(connection, cmd, pos_nl, max_data_size=7 * 1024 * 1024, check_done=True, cmd_name='write_info')
             if data is None:
                 continue
+            truncated_data = len(data) >= 7 * 1024 * 1024
 
             pos = data.find('\n')
             if pos == -1:
@@ -1418,6 +1423,10 @@ def server(server_address_port: int, packages: list, packageIndex: int, resultPa
             if not os.path.exists(info_path):
                 os.mkdir(info_path)
             filename = info_path + '/' + res.group(1)
+            if truncated_data:
+                print_ts('Data is too large. Removing result.')
+                os.remove(filename)
+                continue
             with open(filename, 'wt') as f:
                 f.write(strDateTime() + '\n' + data)
             print_ts('write_info finished for {} ({} bytes / {}s)'.format(res.group(1), len(data), (time.perf_counter() - t_start)))