Should I turn on deduplication in Windows Server to reduce the backup size?
Data deduplication is a powerful feature on Windows Server to reduce the size of storage by eliminating data duplication. However, CubeBackup only backs up new or modified data with each snapshot, so there isn’t much inherent duplication in the backup data.
It is up to you to decide whether data deduplication is used on Windows server. However, unless there is considerable duplication between different users in your G Suite organization, you will not see much difference in backup size.