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  • Both scenarios are possible because neither power loss (including UPS running out) nor system crash can be 100% prevented. These are all for the unlikely aren't they :) But great to know data loss is limited in these scenarios. And thanks for the citation! Commented Nov 26, 2024 at 6:19
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    System crashes generally don't happen that often – I haven't had a Linux file server crash in probably a decade. The problem with UPS running out can be prevented by cleanly shutting down the server before the UPS runs out; NUT network-ups-tools supports monitoring many UPS types via USB or RS232 and triggering an automatic shutdown at low battery (or just a sync if you want, or a script that reduces the writeback interval even further during outages). Commented Nov 26, 2024 at 6:22
  • allowing your ups to shutdown a server sometimes does more harm than good. on the other hand, out of power means out of users, right? Commented Nov 26, 2024 at 19:30
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    This page has a bit more details on the topic. Commented Nov 28, 2024 at 10:28