you could load that size in memory these days in a consumer machine let alone a server . AWS these days have 24TB RAM servers available on demand . 100 GB data

you could load that size in memory these days in a consumer machine let alone a server . AWS these days have 24TB RAM servers available on demand . 100 GB data in even dozen different formats require just regular database . A data lake just for generating reports on 100 GB of data which are going to be used by very few and built by even fewer seems overkill .