Backing up to Drive E: and Acronis is trying to prune F:

I've been able to remedy the situation using a few robocopy commands to delete files on the original disk older than 7 days BEFORE copying to my other drive. The fact I have to do this is just irritating though. The program should not delete files from ANYWHERE except the original backup location ever!

Here is the script:

set _robodel=%TEMP%\~robodel
MD %_robodel%
ROBOCOPY "Path to Backups" %_robodel% /move /minage:7
del %_robodel% /q
robocopy E:\ F:\ /MIR /R:0 /W:0

You must change "Path to backups" to your path and the drive letters to the drive letters you are using.
the script creates a folder in your temp folder, copies all files older than 7 days to that folder then deletes it. Then the backup mirrors the drive to the other drive for backup redundancy. I'm basically pruning backups manually since Acronis is ...unable and unwilling to do it correctly!