For photo storage, the drive type matters less than having proper backups. Neither SSDs nor HDDs are “safe” if you keep only one copy of your images. Use multiple independent copies, ideally including one off-site or cloud backup, and protect against accidental deletion as well as hardware failure.

Directly comparing the two: SSDs are mainly an advantage for speed, which usually doesn’t matter much for an archive. Write-cycle limits are real, but for a photo library they’re usually not a practical issue. HDDs are still attractive for large archives because they offer much more capacity for the money.

One caution with SSDs is long-term, unpowered storage: they may be less ideal for archival use if left unplugged for long periods. HDDs aren’t perfect either, but they remain a common practical choice for bulk photo storage.

So: SSD for editing is great. For archive storage, HDD is often the more practical option, especially at high capacity. But whichever you choose, the key to safety is a solid backup strategy, not SSD vs HDD.