How can I transfer large amounts of files from one computer to another?

A friend is building me a custom rig. The thing is, my current desktop is old and slow, but I have a LOT of files on it that I need to save. Like several hundred gigs, including Music, videos, and Pictures. I considered just using flash drives, but I would either need to buy several smaller ones, or larger ones... show more A friend is building me a custom rig. The thing is, my current desktop is old and slow, but I have a LOT of files on it that I need to save. Like several hundred gigs, including Music, videos, and Pictures. I considered just using flash drives, but I would either need to buy several smaller ones, or larger ones which would strain my budget. What are my options?
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