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Archiving a folder and then re-syncing

I am new to the service and I really like it so far, but I have a really important question:
Lets say that I have a folder on an external disk. I attach the disk to my PC, upload a certain folder and set it as archived. A few months later I make some changes to the folder of my external drive and I want to reflect the changes to my archived folder.
Is it possible or I just have to upload the whole folder?
If it is possible what would be the ideal way to solve this problem?

Thanks in advance!
Have a nice day!
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