Exporting Backup Is Incremental?

Hello,

I would like to have a full backup of all my zimbra data on a NAS device, so I created a cron job to run zxsuite doExport every night. I would like to know if it will export only changes since the last export or if i have 500GB of backup it will always copy 500GB of data. This is a very critical question which might have an impact on my decision of buying the product.

Thank You,
iamcypher.