Comment by creatonez

A disk that is powered off is not holding your data, regardless of whether it is an HDD, SDD, or if it is in redundant RAID or not. Disks are fundamentally a disposable medium. If you don't have them powered on, you have no way to monitor for failures and replace a drive if something goes wrong - it will just disappear someday without you noticing.

Tape, M-DISC, microfilm, and etched quartz are the only modern mediums that are meant to be left in storage without needing to be babysit, in climate controlled warehousing at least.