It consisted of tensors weights, datasets (which can reach several gigabytes), images, 3d models, and roughly 250+ programming projects with binaries, git without LFS and also a lot build files.
Nextcloud was able to sync it all, but syncing was getting so slow that I had to keep my new laptop running for almost an entire day to get all synced to it. It also wasn’t that great at excluding certain folders (like build cache folders or NPM package files), you would have to set up exclusions on each device separately. Another problem with Nextcloud sync was that it would sometimes duplicate projects after had been moved in a subfolder.
An N100 would be fine, I use it for my own server. Despite it being about as fast as an i5-6500T with a general benchmark, quicksync makes a big difference when encoding video with e.g. Jellyfin. I “upgraded” from a i5-6500T to a custom built N100 server and the performance improved a lot. However, if you plan on hosting game servers it probably won’t be enough.