Yes, your site will be on IPFS and we “pin” it for you. Meaning we make sure the network can always serve the content. So as long as you have the CID or the Content Identifier, that’s generated for your content that’s uploaded (You can see that in the site overview section of the site) you can always get to the site. Short answer, yes, the CID will exist forever. Once you set up the DNS or whatever domain you give your site, you will need to renew that. If you purchase the domain through fleek we will renew it for you on the CC you have on file automatically. You can set up a DNS link very easily which allows the domain to work on IPNS as well. We are releasing ENS support very soon, so that will be another option.