@stormi After the informed change, the backup occurred with 100% success, on no disk in the coalesce chain.
We're migrating another cluster to XCP-ng 8!
Thanks for the support, quick return and attention.
If possible, create in the XPC-ng Center the option of Schedule Tasks, such as VMWare ... the options are simple but make the administrator's life easier.
If you can also report to Citrix ...