I doubt that, unless you actually removed records from the database, or removed files from the filestore in case of zip backups. If neither is the case, I would check a restore of one of the small dumps and check whether there is data missing. I had incomplete dumps without error message recently but that may have been due to a misconfiguration on my side.

Thanks Mark. I found that the temp data or so called transient data were deleted after a period of time by Odoo and that made a huge size difference on the dump.