You can! I registered my first account on ml, and moved to sdf, with a third on world as a backup. You can open one on every instance if you want, or more as individual instance rules permit.
That's why you can adjust swappiness, or designate a different high-endurance storage device for it.
You can! I registered my first account on ml, and moved to sdf, with a third on world as a backup. You can open one on every instance if you want, or more as individual instance rules permit.