I dumped synology and just use proxmox for the automatic ZFS support, then I can run my apps in either containers or VMs and even do GPU passthrough if needed.

She’s using Lightroom classic right?

After importing from the SD or CF card, Lightroom stores the original imported photos in a YYYY\YYYY-MM-DD directory. That’s usually where the bulk of the disk usage comes from.

Personally I just move those archived photos older than a few months to external storage and re-map in Lightroom.