Yeah, some people treat UPSes as "backup power" but that's not really what they're intended for. Their intended purpose is to bridge the gap during interruptions... either to an alternative power source, or to a powered-off state.
Sure, but when you stick a UPS in the closet to power your network or security cameras or whatever for a little while if there is a power interruption, you expect:
a) If the power is out too long for your UPS (or you have solar and batteries and they discharge overnight or whatever) that the system will turn back on when the power recovers, and
b) You will not have extra bonus outages just because the UPS is in a bad mood.
Sure, but when you stick a UPS in the closet to power your network or security cameras or whatever for a little while if there is a power interruption, you expect:
a) If the power is out too long for your UPS (or you have solar and batteries and they discharge overnight or whatever) that the system will turn back on when the power recovers, and
b) You will not have extra bonus outages just because the UPS is in a bad mood.