What it is this...
Max Size = 100mb (or we will shut it down for pulling the resorces)
And the (50) means you have have upto 50 individual databases
set up.
My advice - If you have plans to expand - Dont uses them,
there great for "I dont know how".
You have been warned,
I had to leave them for that exact reason - v7.0.0 import from classic = 135mb.
Although 7.1 import would work out smaller,
1&1 do not leave you any room to expand.
If you upgraded to a Dedicated Server just look at the
prices of a Managed, Server its crazy.
End if rant