No, you can upgrade or downgrade the performance of your Vagon computer anytime you want by keeping your data the same. It is like modifying your car in a racing game.
From the dashboard, you can choose any performance option you want. There are 3 main categories and 7 performance options. Depending on your purpose, you can pick any one of them.
Graphics Accelerated Performance Options
Planet - 3.1 GHz - 4 cores - 16 GB RAM - 16GB GPU - NVIDIA Tesla T4
Star - 3.1 GHz - 16 cores - 64 GB RAM - 16GB GPU - NVIDIA Tesla T4 GPUs
Galaxy - 3.1 GHz - 48 cores - 192 GB RAM - 4 x 16GB GPU - NVIDIA Tesla T4 GPUs
Compute Accelerated Performance Options
Lake - 4.0 GHz - 2 cores - 16 GB RAM
Sea - 4.0 GHz - 8 cores - 64 GB RAM
Ocean - 4.0 GHz - 24 cores - 192 GB RAM
General Purpose Performance Option
Sand - 3.1 GHz - 2 cores - 4 GB RAM
You can check the Pricing page for more detailed information.