Audit backup family: backup-whey, whey-state-backup(-weekly), backup-gdrive-to-hdd, api-images-backup, evolutiva-backup@{mars,pluto,venus,enamel}, venus-backup-pull-(daily|weekly)

9 timers marked KEEP on description-reading alone, no verification. For each: confirm last run actually succeeded (check journal/exit code), confirm destination disk/mount has space and is actually being written to, confirm retention/rotation is working (not accumulating forever), confirm nothing else already covers the same data. Backups are the highest-cost-of-being-wrong category in the whole list - do not rubber-stamp these.