A place to share alternatives to popular online services that can be self-hosted without giving up privacy or locking you into a service you don't control.
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Id say rip blurays on your main PC/laptop and build low power device for server.
Streaming musing and sharing photos is not intensive task, but streaming 4k video is another storry. Unless you need 4k streaming you should be fine with almost any intel cpu that supports quicksync and with no gpu afaik. I googled that Lenovo and it seems like it has Xeon E3-1226 v3 which does support quick sync, so I bet it will run just fine. My celeron g3930 can transcode 1080p
Streaming 4k content is not a problem, transcoding on the fly to lower resolutions is hard and requires good capacity planning.
I'm not convinced that a pile of old HDDs is a good fit for your homeserver.
Start with what you have, but if you outgrow your setup, buy proper hardware. And make backups.