That's a pretty old bit of kit. circa 2006. Power hungry too. Known to idle around 180W (!) if it's warm. I'd head in the direction of one of the more modern "microservers". They'll be faster, much much cheaper to run, quieter, you can leverage SSD storage and it'll probably not blow up randomly in 3 months just when you need it. Over 2 years you'll have a net return in investment just on power. Running that IBM box here will cost approx £294 a year, whereas a microserver ~£60 a year. So after 2 years you'll be up £468 on cash which is enough to buy a microserver and mitigate all the other risks. Obviously depends on your electricity cost that but running old stuff is rarely cash efficient other than capital expenditure.
I have opted for the "use the shitty router at the network border that comes with the ISP" and skipped all local file storage because the cost of that is ~£24/year and doesn't take any of my time up managing it.