> runs on a nas, so it can coordinate the backups of the different machines Do we really assume that the "typical home/family" is using a NAS ? I think it far

> runs on a nas, so it can coordinate the backups of the different machines Do we really assume that the "typical home/family" is using a NAS ? I think it far more common that they use "the cloud" like OneDrive, Google Drive, Apple iCloud, etc. That is not a bad thing (privacy issues aside) as data resilience is much much better in the cloud, than almost any NAS you can setup at home. A paid OneDrive subscription gives you dual datacenter redundance (erasure coding) with unlimited versions for 30 days of all files, copy on write, and much more. And regarding privacy, that is also not an issue that the "typical" user is concerned about. All the big vendors pretty much swear to never look at your data _unless you share it_, and for the "nerds", things like Cryptomator exists. In my book, and one i use myself, a modern setup will have the cloud as primary storage, and "all you need" is a local box that can synchronize cloud data locally with versions, or make a versioned backup locally (the sync is useless if upstream gets corrupted). In theory a "real time" sync of data and scheduled BTRFS/ZFS/APFS snapshots every N minutes would be a versioned backup. On top of that you then add a cloud backup of the synchronized data to a different cloud provider, and you have 3-2-1 backup in place. This will, for most users, be cheaper than buying and running a NAS, as the average family probably has less than 2TB data, and comes with less risk of data loss due to hardware failure. The biggest threat to your data in the cloud is loss of access, which you can mitigate with the local mirror and the remote backup. You can get Microsoft Family 365 for around €65/year (Microsoft HUP program and other deals), which includes 6 x 1TB OneDrive storage. Add to that a Backblaze Backup subscription at €65/yeaer and you have both primary cloud storage and cloud backup at €130/year. Where i live, just powering a 4 bay NAS for a year costs around €200. > Synology active backup for business, which I use now, goes there about 70% of the way. Any suggestions for alternatives? I personally use Arq for my client backups, but it does not support global deduplication, only per marchine. For global deduplication, you might want to look at Restic (open source, stable), Duplicacy (commercial license) or Kopia (open source, beta state)