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As this is network attached storage, accessed via SMB or FTP, what difference does it make what file system it's running?
I don't know much about macs, nor spotlight, but I don't think it works with network attached storage at all.Whatever device or software you use to access the files on the NAS will be using the SMB or FTP protocols. To that end, it makes no difference what file system is running other than for data integrity or performance.
You really should have a better understanding of these things before stating ill informed information