As time moves forward you may also want to make sure you still have the installations of all the
required software in the supported versions, as those version might become unavailable in the future. It wouldn't be the dumbest idea to at least save once:
- your HTTP server (most likely Apache)
- your DMBS software (most likely MariaDB or MySQL)
- PHP
...each in the versions you currently use and make sure you're able to still install them. If that was done by the hoster in the past then keep in mind that in 5-10 years they might offer you only different versions of that software, or even completely different software.
Why keeping software installation packets which might be outdated in the future? Not because you want to go live with that, but because you want your website to get run at least (which can also happen without access to the internet) to then be able to migrate it to up-to-date software.