Ask Slashdot: What’s the Ultimate Backup System? Cloud? Local? Sync? Dupes? Tape…?

Long-time Slashdot reader shanen noticed a strange sound in one of their old machines, prompting them to ponder: what is the ultimate backup system? I’ve researched this topic a number of times in the past and never found a good answer… I think the ultimate backup would be cloud-based, though I can imagine a local solution running on a smart storage device — not too expensive, and with my control over where the data is actually stored… Low overhead on the clients with the file systems that are being backed up. I’d prefer most of the work to be done on the server side, actually. That work would include identifying dupes while maintaining archival images of the original file systems, especially for my searches that might be based on the original folder hierarchies or on related files that I can recall being created around the same time or on the same machine… How about a mail-in service to read old CDs and floppies and extract any recoverable data? I’m pretty sure I spotted an old box of floppies a few months ago. Not so much interested in the commercial stuff (though I do feel like I still own what I paid for) as I’m interested in old personal files — but that might call for access to the ancient programs that created those files. Or maybe you want to share a bit about how you handle your backups? Or your version of the ultimate backup system…? Slashdot reader BAReFO0t recommends “three disks running ZFS mirroring with scraping and regular snapshots, and two other locations running the same setup, but with a completely independent implementation. Different system, different PSU, different CPU manufacturer, different disks, different OS, different file system, different backup software, different building construction style, different form of government, etc.” shanen then added “with minimal time and effort” to the original question — but leave your own thoughts and suggestions in the comments. What’s your ultimate backup solution?