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https://blog.it-kb.ru/2019/06/26/sharepoint-2016-farm-backup-on-behalf-of-gmsa-account-and-resolving-errors-the-local-farm-is-not-accessible-and-object-search-service-application-failed-in-event-onbackup/
Резервное копирование фермы SharePoint 2016 от имени учётной записи gMSA и решение ошибок "The local farm is not accessible. Cmdlets with FeatureDependencyId are not registered" и "Object Search Service Application failed in event OnBackup"