diff --git a/lib/syskit/cli/log_runtime_archive.rb b/lib/syskit/cli/log_runtime_archive.rb
index 8d47e92f3..a05fb7be0 100644
--- a/lib/syskit/cli/log_runtime_archive.rb
+++ b/lib/syskit/cli/log_runtime_archive.rb
@@ -176,9 +176,14 @@ def self.transfer_dataset(
                     end
 
                 transfer_results = candidates.map do |child_path|
-                    result = transfer_file(child_path, server, root)
-                    child_path.unlink if result.success?
-
+                    child_partial_path = Pathname.new("#{child_path}.partial")
+                    File.rename(child_path, child_partial_path)
+                    result = transfer_file(child_partial_path, server, root)
+                    if result.success?
+                        child_partial_path.unlink
+                    else
+                        File.rename(child_partial_path, child_path)
+                    end
                     result
                 end
 
diff --git a/lib/syskit/roby_app/log_transfer_server/ftp_upload.rb b/lib/syskit/roby_app/log_transfer_server/ftp_upload.rb
index 228a98d9a..f0bf33040 100644
--- a/lib/syskit/roby_app/log_transfer_server/ftp_upload.rb
+++ b/lib/syskit/roby_app/log_transfer_server/ftp_upload.rb
@@ -87,8 +87,10 @@ def chdir_to_file_directory(ftp, root)
                 def transfer(ftp, root)
                     last = Time.now
                     chdir_to_file_directory(ftp, root) if root
+                    partial_file = @file
+                    renamed_file = partial_file.basename.to_s.sub(/\.partial$/, "")
                     File.open(@file) do |file_io|
-                        ftp.storbinary("STOR #{File.basename(@file)}",
+                        ftp.storbinary("STOR #{renamed_file}",
                                        file_io, Net::FTP::DEFAULT_BLOCKSIZE) do |buf|
                             now = Time.now
                             rate_limit(buf.size, now, last)