To restore all files in the least time possible, use the ``Overwrite if older" option and restore your disks in backwards order: Restore the most recent incremental backup folder first, then the next most recent, etc. and ending with the oldest incremental folder. Finally, restore the most recent full backup.
For example, if you have a full backup named E.FUL and three subsequent incrementals named E.001, E.002 and E.003, restore the folder called E.003 first, then restore E.002 and E.001, and last, restore E.FUL.
By restoring the disks in reverse order, the first version of a file that The Key encounters is the most recent one. When it later comes to older versions, they are skipped since a newer version has already been restored. If the disks were restored in the same order as they were created, then every version of each file except for the latest would be restored and then later erased as newer versiosn came along, and the latest would be restored last. This would still produce a correct result but would be slower.