I tried it again, after reading your ticket, across different servers and two different Dropbox accounts. In all cases it works perfectly if you have enabled the remote file quotas and set the count quota to 3. However, there is a small pitfall here. If you enable the day quotas (which prescribe that the X latest backups and the backups backups on the Yth day of the month must be kept) then all other quotas are overridden. Moreover, quotas will only work for backups listed in the Administer Backup Files page as Remote and are taken with Akeeba Backup 3.4.0 or later.
Nicholas K. Dionysopoulos
Lead Developer and Director
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