docs(backups/mirror): health check only applied on the last transferred

docs/mirror_backup.md

@@ -10,7 +10,7 @@ Just go into your "Backup" view, and select Vm Mirror Backup.
 Then, select if you want to mirror incremental backups or full backups.
 You must have exactly one source remote, you must have one or more destinations. The mirroring speed will be limited by the slower remote.
 
-Most options of the full/incremental backups applies here, like concurrency (number of VM transferred in parallel), report, proxy and speed limit. You can also add a health check on schedules.
+Most options of the full/incremental backups applies here, like concurrency (number of VM transferred in parallel), report, proxy and speed limit. You can also add a health check on schedules. Please note that only the last transferred backup (if any) will be checked.
 
 :::tip
 If you have full and incremental backups on a remote, you must configure 2 mirror backup jobs, one full and one incremental.