diff --git a/@xen-orchestra/xapi/disks/Xapi.mjs b/@xen-orchestra/xapi/disks/Xapi.mjs
index 6e0f1c71d7..d744c4cb6f 100644
--- a/@xen-orchestra/xapi/disks/Xapi.mjs
+++ b/@xen-orchestra/xapi/disks/Xapi.mjs
@@ -7,6 +7,7 @@
 
 import { DiskLargerBlock, DiskPassthrough, ReadAhead, TimeoutDisk } from '@xen-orchestra/disk-transform'
 import { createLogger } from '@xen-orchestra/log'
+import { Task } from '@vates/task'
 import { XapiVhdCbtSource } from './XapiVhdCbt.mjs'
 import { XapiStreamNbdSource } from './XapiStreamNbd.mjs'
 import { XapiVhdStreamSource } from './XapiVhdStreamSource.mjs'
@@ -14,7 +15,6 @@ import { XapiProgressHandler } from './XapiProgress.mjs'
 import { XapiQcow2StreamSource } from './XapiQcow2StreamSource.mjs'
 import { VDI_FORMAT_QCOW2, VDI_FORMAT_VHD, VHD_MAX_SIZE } from '../index.mjs'
 
-// @todo how to type this ?
 const { debug, info, warn } = createLogger('xo:xapi:xapi-disks')
 
 /**
@@ -111,7 +111,10 @@ export class XapiDiskSource extends DiskPassthrough {
       }
     } catch (err) {
       if (err.code === 'NO_NBD_AVAILABLE') {
-        warn(`can't connect through NBD, fall back to stream export`)
+        const warningMessage = `can't connect through NBD, fall back to stream export`
+        // @ts-ignore Task.warning is a static alias set up dynamically, not visible to TS
+        Task.warning(warningMessage)
+        warn(warningMessage, err)
         if (streamSource === undefined) {
           throw new Error(`Can't open stream source`)
         }
@@ -189,7 +192,10 @@ export class XapiDiskSource extends DiskPassthrough {
       // init probaby failed, so nothing to close , but better safe than sorry
       await source?.close().catch(warn)
       if (baseRef !== undefined) {
-        warn(`can't compute delta ${vdiRef} from ${baseRef}, fallBack to a full`, { error })
+        const warningMessage = `can't compute delta ${vdiRef} from ${baseRef}, fall back to a full`
+        // @ts-ignore Task.warning is a static alias set up dynamically, not visible to TS
+        Task.warning(warningMessage)
+        warn(warningMessage, { error })
         this.#baseRef = undefined
         return this.#openExportStream()
       } else {
diff --git a/CHANGELOG.unreleased.md b/CHANGELOG.unreleased.md
index 4262383ed7..ec43aca2fc 100644
--- a/CHANGELOG.unreleased.md
+++ b/CHANGELOG.unreleased.md
@@ -53,6 +53,7 @@
 - [XO6/New VM] Add the possibility to set the HA restart priority when creating a VM (PR [#10072](https://github.com/vatesfr/xen-orchestra/pull/10072))
 - [REST API] Add `POST /srs` REST route to create a storage repository (PR [#9990](https://github.com/vatesfr/xen-orchestra/pull/9990))
 - [XO6/Pool] Add connect/disconnect action on page Site (PR [#10075])(https://github.com/vatesfr/xen-orchestra/pull/10075)
+- [Backups] Show reason when delta backup falls back to a full (PR [#10148](https://github.com/vatesfr/xen-orchestra/pull/10148))
 
 ### Bug fixes
 
@@ -99,7 +100,7 @@
 - @xen-orchestra/rest-api minor
 - @xen-orchestra/web minor
 - @xen-orchestra/web-core minor
-- @xen-orchestra/xapi patch
+- @xen-orchestra/xapi minor
 - vhd-lib patch
 - xapi-explore-sr patch
 - xen-api minor