Take a look at this list: https://networkupstools.org/stable-hcl.html
I use an older APC Back-UPS 500 to power my homelab and all network devices. So far it’s saved me from 3 power outages, and can last about 30 minutes with a 50W power draw. It doesn’t have data connections of its own (newer devices do), so I had to improvise with an ESP32 board that reports if it detects a voltage on the beeper, plus some cron jobs on Proxmox.
If you have a way to sync files (Nextcloud, Syncthing, etc): KeePassDX on Android (f-droid), and KeePassXC on Linux (Flathub). They both support TOTPs, and XC has browser and libsecret integration.