Backup to removable USB drives (over time)

Hi;
I've been using TI 2010 to backup 'on-demand' to USB 3.0 attached removable drives, and now I was trying to do the same thing using TI 2014. (This is all manual, so no scheduling is involved).
But, I seem to keep running afoul of TI 2014's built-in database where it gets 'confused'.
What is the recommended way to make/keep sets of backups (of the same systems drives) on different removable USB drives?
What I've been doing with TI 2010 is making a series of full+incremental backups to a given external drive, then switching to the next external drive as needed. So, each drive has a full backup and several incremental backups as I see fit. Often, I add an incremental backup to a full backup by booting the WinPE media. I rotate through all the external drives and eventually erase/overwrite the data from the oldest backups.
When I tried this with TI 2014, the listed entries seem to get 'confused', and I've made it work so far by always deleting all the entries on the backup list and re-finding the current entries each time.
Is there a way to set this up so TI 2014 knows to keep the same backup entry and just make a new Full backup when it's time to re-use the next external drive (overwrite the oldest)? (The external drives always show up as the same drive letter, and I usually first erase the oldest backup on the current external drive).
Is there an easier way? I knew how to work around TI 2010, but so far I keep fighting the 'catalog' built in to 2014.
Thanks;

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