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For whatever it's worth, in the past I have encountered problems with "copier" software silently missing files. Admittedly I was dealing with very large file sets, very long paths, and unicode names, all back when a lot of software would have trouble with just one of those let alone all three, and the less-than-reliable hardware I was (ahem) relying on at the time probably didn't help, but the important takeaway is that if you're working with "irreplaceable" data you might want to stress-test your copier and verify that it is actually doing what it says it's doing.

In the File Placement Rules section: your FIRST (uppermost) rule should be that all files matching "\movies\*" are to be placed on all drives INCLUDING that one (check all drives) your LAST (lowermost) rule should be that all files matching "*" are to be placed on all drives EXCLUDING that one (check all the others, leave it unticked, and in your particular case you also want to select "Never allow files to be placed on any other disks" for this rule). Any other rules you might have should be placed ABOVE the LAST rule, and should not have that drive checked (and again, you may wish to select "Never allow..."). This is because FPR checks the rules from uppermost to lowermost until it finds a matching rule for the file being balanced and then uses only that rule. NOTE that File Placement is only performed when balancing is triggered instead of in real time; you might wish to use the SSD Optimizer balancer plugin to mark at least one of the other disks as "SSD" so that new files are never even temporarily placed on the 6TB HDD, which is otherwise possible even if you have "Balance immediately" selected in the Settings tab.

another way would be if you dont need duplication 1 dont add the disk to the pool 2 use backup software - set a job to copy the changed/added files to it - nightly job or similar simpler and you dont have to mess with FPR's that may get complex also you can detach it and move it to another pc without having to remove it from DP as it would throw an error

I have never tried to use File Placement Rules but as I understand it, if you tell DP to place \movies on that 6TB HDD then it will and also spill over to other drives when the 6TB HDD is full. DP will not, I think, through a no space error. Not sure how to ensure that non other data arrives on that drive, that might need a lot of FPRs, but may be easy. Having said that, I would not add a drive I am suspicious about if, unlike me, you do not use duplication. Do you have Scanner? Maybe run the Seagate tool again.