All FTP backup jobs become Full = "Every Time" with upgrade

ewok is right about the difference being push vs. pull, but the push functionality is definitely hosed for users like me that perform frequent incrementals. As a supplement to my main backups, I also pull DB backups down from a server twice a day and then push them up to another server (using two separate jobs, scheduled every 12 hours, staggered by one hour). There are two DB's, so each job should move two files. See logs, below.

FULL Backup started. Thu May 26 13:05:02 EDT 2011
Job: 007
Protocol: ftp
Source: ftp://[removed]
Destination: [removed]

[2 lines removed]

FINISHED --2011-05-26 13:05:21--
Downloaded: 2 files, 282K in 0s (537777 GB/s)
Backup finished. Thu May 26 13:05:21 EDT 2011

vs.

FULL Backup started. Thu May 26 02:05:02 EDT 2011

Job: 011
Protocol: ftp
Source: [removed]
Destination: ftp://[removed]

[282 lines removed]

Backup finished. Thu May 26 02:19:37 EDT 2011

This still works for my tiny DB backups directory, but my main backup operates on a directory that grows about 50GB/mo. So it is of no use to me now.