Backup software is chosen almost entirely on how easy backing up looks in a demo, because that's the part vendors show. The feature that actually matters — restoration — is rarely demonstrated with the same enthusiasm, because restoration is where the genuine complexity and the genuine differentiation between products lives, and it's harder to make look impressive in a fifteen-minute sales call.
Restoration speed at real data volumes is the first thing to test before committing, not after an incident forces the question. A backup product that comfortably backs up a hundred gigabytes overnight may take considerably longer than an acceptable recovery time objective to restore that same hundred gigabytes when it's actually needed — the two operations aren't symmetric, and a product's marketing rarely volunteers restore-time figures the way it volunteers backup-window figures.
Granularity of restore matters as much as speed for the failure modes that actually happen most often. A full system restore is needed rarely; a single accidentally deleted file or a corrupted individual mailbox is needed constantly, and a backup product that only supports restoring the entire backup set, rather than picking out one file or one mailbox cleanly, turns every small everyday recovery into unnecessary overhead.
The only test that actually validates a backup strategy is a real restore, performed on a schedule, by someone who didn't set up the original backup job. Backups that have never been restored should be assumed broken until proven otherwise — the common failure modes are mundane and invisible until tested: a credential that expired silently, a retention policy that quietly deleted what was needed, a backup job that's been failing for weeks with an alert nobody read. A restore rehearsal that surfaces one of these problems on a calm Tuesday is worth immeasurably more than discovering it during an actual incident.
