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I'm a huge data hoarder and I know and I have the capacity to buy more and continual storage but I would like to know if there is a more efficient way to compress files because I already used, as far as I know the most efficient compression method.

Also as a graphic designer I'm constantly hoarding pictures and photos for clients because they come back to me occasionally meaning I don't want to delete stuff but I also don't want to put stuff on cloud storage even though all my colleagues suggest that I should.

Any suggestions?