Either pay a cloud storage provider about $4/month to hold it for you, or buy a couple external drives and verify your backups yourself about once a year then replace drives as they eventually fail.
I figure the break even point is about two and a half years. If you’re committed to hoarding your content for longer than that, buy storage drives. If not, rent cloud storage. If your drives die in less than that you would have been better with cloud storage, but that isn’t likely.
That and https://filebrowser.org is free.