&gt; This is a ridiculous scenario. If you have some files on your laptop that are super important, you probably shouldn&#x27;t `rm -rf` them 1.5 seconds after uploading to your NAS.<p>There is nothing ridiculous about a hard drive breaking between backups. There are situations where loosing all data after latest backup would be, if not unrecoverable, at least extremely irritating. Having redundant drives in a laptop might not be feasible, but dedicated workstations are still used in many places.<p>&gt; If you really are going to immediately purge some critical data from its source location 1.5 seconds after fsyncing to your drive, you should be sending it to multiple locations and waiting for confirmation containing a valid checksum before considering the write a success.<p>Which is exactly what ZFS&#x2F;btrfs in a mirrored RAID configuration does.