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Important backups should be stored in a variety of ways. I store my backups on multiple external HDD’s (solid state and spinning disks) in redundancy. Using multiple filesystems (ext4, and exFAT). I do use ZFS for daily/active storage but not for backups. Besides that I also store the data in AWS S3 and a duplicate in Backblaze B2. These solutions are scalable. iCloud/Google Drive is good if you only have 2TB or less.

Just store the raw files directly in a regular file tree structure and avoid any kind of catalog/index/db file.

I do find ZFS very interesting but in practical use it has been trouble working with, getting weird errors when trying to remove a vdev.