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Definitely overthinking it. Specifically, while StableBit DrivePool will rebalance data, most of the default enabled balancers handle edge cases, so there should be very little balancing that occurs, once the pool has "settled". There is a brief summary of these balancers here: https://stablebit.com/Support/DrivePool/2.X/Manual?Section=Balancing Plug-ins#Default Plug-ins But for ease: StableBit Scanner This plug-in is designed to work in conjunction with the StableBit Scanner version 2.2 and newer. It performs automatic file evacuation from damaged drives and temperature control. Volume Equalization This balancer is responsible to equalizing the disk space used on multiple volumes that reside on the same physical disk. it has no user configurable settings. Disk Usage Limiter This plug-in lets you designate which disks are allowed to store unduplicated vs. duplicated files. It doesn't do anything unless you change its settings to limit file placement on a disk. Prevent Drive Overfill This plug-in tries to keep an empty buffer of free space on each drive part of the pool in order to facilitate existing file expansion. Duplication Space Optimizer This plug-in examines the current data distribution on all of your pooled disks and decides if some data needs to be rebalanced in order to provide optimal disk space availability for duplicated files (see About Balancing for more information). The StableBit Scanner balancer may move stuff around a lot, but only if it detects issues with a drive. And the Duplication Space Optimizer will try to rebalance the data to minimize the amount of "Unusable for duplication" space on the pool. Aside from that, none of these should move data around much, normally.