Option to exclude certain file formats in export

Now i dont want my exports ( which i use as a backup ) to be in gigabytes only because of videos, because i store those videos externally already, which are in the range of 50Gbs, so storing the backup will take the same amount of storage which is unnecessary and would occupy double amount of my storage and will be a waste of storage, if export would have an option to exclude file formats, like .mkv or .mp4, it would be really helpful and efficient backup process, thank you!