I am on the spark plan with several domains hosted on webhostinghub. I want to have a cloud storage system but don't want to be paying major companies like Google, Apple, Microsoft etc regular fees. I was wondering what the best way was to do this by making the most of the spark plan. It is crucial to mention I really don't actually want sync options etc. I don't want to accidentally delete something from a local PC or device and then it automatically deletes from the cloud system. Really, I just want a relatively clean interface, with a login system, where I can store 500gb to 1tb of my own personal junk. Should I just use the FTP system (but this looks a little too basic), or is there a basic template I can apply to one of my domains for free which I can use with no extra fees? (Is using 500gb to 1tb acceptable on the spark plan?)

Bonuses like image thumbnails, music players, video players, file previews etc would also be great if something like that exists. I have seen stuff like owncloud, but this requires fees at higher levels. I just want to have everything run myself for no extra fees.