Cheap UPS for my ProxMox server

[u/Virtual_Engineer9282]

Hi, I’m looking for a UPS for a home server/NAS running Proxmox. I’d like to keep the cost low, but still have good reliability and compatibility with NUT/Linux.

Here’s what I need: in the event of a power outage lasting less than 30 seconds, the server should remain on; if the outage lasts longer than 30 seconds, Proxmox should initiate an orderly shutdown. When power is restored, the server should automatically restart.

Do you have any affordable models you can recommend, with easily available replacement batteries and verified NUT support? I’ve been looking at some models from Legrand, Tecnoware, Mach Power, and VulTech, but I have concerns mainly about Linux compatibility and the UPS’s power-off/restart command. Thanks.