This is what I did:
Created 2 seperate Folders on a single DFS share.
Folder1 - Test1 contains 1.txt - 10.txt
Folder2 - Test2 contains a.txt - j.txt
Each file contains its file name without the extension as its data.
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Created 2 seperate Selection Lists. Both include Test1. First selection list contains Test1 and Test2. Second selection list contains Test1 and a second folder of unchanging data.
The first selection list will be for the differental backups. The second selection list will be for incremental
I created two different media sets to use with these, but used the same B2D device.
I used modified time to back these up.
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Full Backup - Diff ( Backed up all files)
Full Backup - Incremental ( Backed up all files)
Changed files ( Changed 1.txt, Changed 2.txt, Changed 3.txt)
Differental Backup (Backed up 1,2, and 3)
Incremental Backup (Backed up 1,2, and 3)
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Changed Files (Changed 4.txt, Changed 5.txt)
Differental Backup (Backed up 1 - 5)
Changed Files (Changed 6.txt , Changed a.txt , Changed b.txt , Changed C.txt , changed d.txt)
Differental Backup (Backed up 1 - 6, a - d)
Incremental Backup (Backed up 4 -6)
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Change files (Changed 7.txt , changed e.txt)
Differental Full Backup (Backed up all files)
Incremental Backup (Backed up 7)
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Change files (Changed 8.txt , changed f.txt)
Incremental Full Backup (Backed up all files)
Differental Backup (Backed up 8 and F)
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So in summary it looks like Backup Exec keeps the two backups seperate. I'm not sure if it seperates by Media type or by Selection list, but the two do not look to effect each other.
Jonathan