@Greg@social.coop I had a UPS for my Synology NAS for years, rarely needed. A few years in we had a power cut and I discovered the hard way that the battery had almost no capacity left, but the NAS was fine. I replaced the battery. A few years later the UPS emitted a puff of magic smoke and died. It was an APC model. I decided I'd rather live with the risk of disk corruption than a fire risk so I haven't replaced it. Later the disk did die, but I think it was due to a burst of EMC from the router next to the NAS. I reformatted the disk in a PC and it was fine. But I lost my data. Since I use the NAS as a backup and fast local media source all the data existed elsewhere and I just repopulated the NAS from there (which took a couple of days). I hope that helps.