Yes when it comes to RAID, a UPS is a must.
Linux MDADM is not resiliency against power lose. And will overwrite from master if they are not equal.
Cow system ZFS, LVM, BTRFS and similar, have separate metadata table to compare against. But even then they can be affected by write hole in the event of a powerloss.
If you are thinking it for “backup” for redundancy in case of disc error, a solution can be to use something like borg backup, and a source disk as a BTRFS file system so you can be notified if there is checksum errors.
A cheap UPS is 60€, it will work good enough.



When i have a plex lifetime pass from 2016, dam 10 years. Plex works fine, my biggest complaint is the other steaming service they are trying to sell (luckily you can disable it), offline viewing on mobile needs a lot of love.
Everything else works good enough. Why should i spend time on converting?
My next thing I want to replace is my good Nvidia Shield, sadly with Android TV that 1/3 of my main page is an ad , and i can’t easily turn if off. And have not found a good alternative launcher.
It is like Microsoft windows, enshittification.