I would say that bigalloc is probably not what you want for an archival system. It is relatively new and the space savings is minimal. It is mostly for filesystems that need to allocate and free large files rapidly.
And does it introduce any memory usage benefit? Maybe not on a 1TB, but on a 32TB partition? :) I.e. does the kernel keep full block bitmap (or maybe a tree of blocks?) in memory, or does it read parts of it when they're needed?
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