Now that you have an UPS, put reminders on changing the batteries. My experience with both high end professional units and low cost home units is that batteries last two years more or less and can be expensive to replace.
Having an ups is great, having it fail unexpectedly because the battery packs go from 100% to 1% instantaneously as soon as a load is applied, not so much
I might have been unlucky, but I had mine fail always at the worst possible moment and without the slightest warning.
My current solution is a laptop (but look out for bulging batteries!) And ups backed USB (not cheapo ones!) Jbod or raid enclosures. In this cas e a 50€ battery pack is enough for a brief power outage.