Yes. We do not support swaping data into disk yet, but we are working on it.
Currently we cannot modify (update) a single entry data (e.g. we have a column with book prices, we cannot change a price per book). However, you can rename database / table / column or you can change a column data type which will result in casting the data and therefore possible modification of data.
We are saving only modified columns during autosave. How often an autosave is triggered can be changed in configuration file (the value is in seconds). Currently, any changes which were not persisted into disk will be lost if a database crashes or server goes down. We will look at this when we will support data updates as well.