

Well, a quick check of my Mini-PC which has a bit more software than Lubuntu and Kodi but not by much (so, also stuff like Firefox and qbittorrent) shows a bit over 20GB used for everything but the mount to were the qbittorrent is downloading files, so even in this day and age of stupidly expensive storage all the storage you need is still going to be about €20 or less (that’s the price of a new 64GB SATA SSD from AliExpress, which should fit the same connectors as your HDDs unless those PCs are so ancient they still use PATA instead of SATA).
I expect a dedicate distro for just a TV box like LibreELEC should be even smaller.
Mind you, I have the storage for the videos I watch in Kodi outside in the form of portable mobile HDDs since its a much better price per GB for bulk storage and the speed of even mobile HDDs is fine for playing h264 and h265 compressed stuff, so that’s of course not counted in those 20GB.
Upgrading an old PCs with a 64GB SATA SSD should be reasonable cheap and more than enough to run either LibreELEC or Lubuntu with Kodi plus a bunch of extra stuff.
That said, the benefit of a Mini-PC like the one I got (with an N100 processor or similar) is that it uses very little power (unlike old desktop PCs or even notebooks) so it’s cheap to just leave running all the time and it’s quiet.









Alternativelly, having been bitten by a radioactive animal early that day, they’re now an animal themed superhero.