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two things wrong with the old code: * the sort function wants -1, 0 and 1 as a return value for a<b, a==b and a>b respectively, not a bool (which a < b returns) * we have to sort the newest backups first, since the first reason is 'keep-last'. until now, we sorted the oldest backup first, resulting in the older backups getting the 'keep-last' reason reported by a user in the forum: https://forum.proxmox.com/threads/prune-ui-and-prune-schedule-simulator-dont-match.94944/ Signed-off-by: Dominik Csapak <d.csapak@proxmox.com>