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This beckons the questions if the Borg have backups of the hivemind to roll back to, just in case.
The plan to use Hugh as a weapon against them indicates they do not...although there's always time travel, I suppose.
One way or another they want to assimilate the entire human interent so I doubt they're smart enough for backups.
Considering they are supposed to be past the computer age and at the deep space exploration age, it would be insane to not have tons of redundancies and work arounds, probably very poorly documented ones too. You think borg religion is about trusting old undocumented code no one knows the function of anymore?
Borg in the middle of a battle, systems corrupted, restoring backups, systems not available for three hours. Then some small ship thinks they know how to defeat the Borg only for their civilization to be wiped out.
I'd pay to watch that plotline
I suspect that there are multiple Borgs at different, distinct levels of advancement and organization, some so far removed from the others that they bare little resemblance.
See: TNG v Voyager
They just use RAID0
They are a collective consciousness, not a computer program.