I ask about this, because in Netload's TOS in punkt 9.b akapit 2 is information :
If after storing more than 500 GB on Netload, your account is inactive for more than 30 days, files will be deleted to bring your stored amount below the 500 GB limit.
, and I'm not sure when the files will be deleted. Hehe is information about inactive account and no words about undownloaded files.