If you find that your backups are taking up too much disk space, there is an alternative solution that will reduce disk usage.
If you perform an Export with "Exclude Content" selected, compress the file store and keep them together. This will allow you to have a compressed version of your filestore which is only the size of "Binaries Size" to begin with. This can be done with a short script.
Note that this will only work for full backup and full system import.