I have a DIY 12VDC output UPS connected to my NAS and PLDT Fibre modem. It can last a power outage longer than 1 hour. I leave it unattended in my office. One time, when power went out at night, the modem lost internet connection even with the UPS. We only restored internet after manually I rebooted the Fibre modem. I no longer put the modem on the UPS. Just the NAS na lang.
I switched from Globe DSL to PLDT Fibre the moment Fibre became available. Because Globe DSL uses remote DSLAM within our village, phone/internet service is also cut when the Meralco power is lost.