fix(backup): transferred backup size for incremental backup

@xen-orchestra/backups/_runners/_writers/IncrementalRemoteWriter.mjs

@@ -204,14 +204,18 @@ export class IncrementalRemoteWriter extends MixinRemoteWriter(AbstractIncrement
             // TODO remove when this has been done before the export
             await checkVhd(handler, parentPath)
           }
-
-          transferSize += await adapter.writeVhd(path, deltaExport.streams[`${id}.vhd`], {
+          
+          // don't write it as transferSize += await async function
+          // since i += await asyncFun lead to race condition
+          // as explained : https://eslint.org/docs/latest/rules/require-atomic-updates
+          const transferSizeOneDisk = await adapter.writeVhd(path, deltaExport.streams[`${id}.vhd`], {
             // no checksum for VHDs, because they will be invalidated by
             // merges and chainings
             checksum: false,
             validator: tmpPath => checkVhd(handler, tmpPath),
             writeBlockConcurrency: this._config.writeBlockConcurrency,
           })
+          transferSize += transferSizeOneDisk
 
           if (isDelta) {
             await chainVhd(handler, parentPath, handler, path)

CHANGELOG.unreleased.md

@@ -44,6 +44,7 @@
 <!--packages-start-->
 
 - @vates/nbd-client major
+- @xen-orchestra/backups patch
 - @xen-orchestra/xapi minor
 - vhd-lib patch
 - xo-server minor