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I have got a Veracrypt file that is approximately 100GB on an external hard drive. I make changes to the contents of this container often, and would like to know a way to quickly back up the updated file to a second external hard drive.
I am aware I can copy the file directly to the second drive after I am done working with it, but it will take a while since it is large. Is there a way to update changed portions of the file with rsync, for example? I understand the file is encrypted, which isn't very useful considering the methods used for comparison when copying.
How else can I do this?