Arkly files are stored on the Arweave permaweb network which has an innovative, one-time endowment model that funds the storage of at least 40 copies of each file for at least 200 years.
Of course, we have no idea what the world will be like in 200 years and whether we will even be using the same electricity-powered, digital information technologies we are familiar with today.
Arweave's goal is data permanence not network permanence, i.e. give our invaluable information a chance of surviving long enough to migrate to future information access technologies.