9 files declare their use of BackupMigrateException in Backup and Migrate 8.4

BackupMigrate.php in lib/backup_migrate_core/src/Main/BackupMigrate.php

DrupalDirectoryDestination.php in src/Destination/DrupalDirectoryDestination.php

DrupalUtils.php in src/Filter/DrupalUtils.php

FileDirectorySource.php in lib/backup_migrate_core/src/Source/FileDirectorySource.php

MySQLiSource.php in lib/backup_migrate_core/src/Source/MySQLiSource.php

Schedule.php in src/Entity/Schedule.php

TarArchiveReader.php in lib/backup_migrate_core/src/Service/TarArchiveReader.php

TempFileAdapter.php in lib/backup_migrate_core/src/File/TempFileAdapter.php

WritableStreamBackupFile.php in lib/backup_migrate_core/src/File/WritableStreamBackupFile.php