My turn-of-the-year project to move this website off a vintage 2012 server running Ubuntu onto a slightly-less-vintage 2019 server running TrueNAS Core (an 'appliance' built on top of FreeBSD) is now complete. What's more, there's a backup of it running on a TrueNAS Scale server (another 'appliance' built on top of Debian), on a server I was gifted when the company I was working for in Australia in 2012 sold itself off to a rival and all the staff were made redundant. It's my oldest-ever server, I think: vintage 2010 or thereabouts, but I've specc'd it up with 2 12-thread Xeon CPUs (so, 24 threads in all) running at 2.8GHz, and with 192GB of RAM. So definitely old, but not exactly shabby -and more than capable of running the 30 or so virtual machines I need to test my software against most varieties of Linux and Windows, in addition to acting as my music, video and website backup server.
Apart from a couple of outages today as the final moves of the (very noisy!) servers into their designated loft space took place, I don't think anyone would have noticed much by way of change or disaster! In fact, 95% of the move was finished on January 1st, well before my own announced deadline. The other 5% has been getting the backup server configured properly, which took longer than I expected because I chose to upgrade the CPUs and the RAM... and then managed to buy two sticks of faulty RAM and had to wait for replacements to be shipped from Germany.
Anyway: all done and dusted, I hope! Onwards and volume-control-upwards!