Content takes up a lot more space than expected.

Question

I just got a new 32 GB iPhone 5s.
When I set it up, I used the backup from my 32 GB iPod Touch so that all my messages, apps, settings, etc would be transferred over.
32 GB iPod Touch has 14.4 GB free.
32 GB Phone 5s with the same exact content only has 4.7 GB free!
I am using the same exact sync settings.  The main difference I'm seeing is that my iPhoto collection is reporting three times larger on the iPhone than it was on the iPod Touch.  Obviously the iPhone iOS is a different version too but the discrepency between the amount of free space on each device is huge.
Can anybody explain this?  Thanks.

Answer 1

Well mostly. I set it to 1% the numbers looked good and I thought it'd be okay, however after setting the reserved space to 0% I still missed 19GB. On a closer look we can see that the Ext3 filesystem is around 20GB smaller than the XFS one, and I can't really understand that:
[root@dude ~]# tune2fs -m 0 /dev/data-backup/fileserver
tune2fs 1.40.3 (05-Dec-2007)
Setze Verhältnis der reservierten Blöcke auf 0% (0 blocks)
[root@dude ~]# df -h
Dateisystem Größe Benut Verf Ben% Eingehängt auf
/dev/mapper/data-fileserver
699G 607G 93G 87% /mnt/fileserver
/dev/mapper/data--backup-fileserver
679G 606G 74G 90% /mnt/backup
Both LVM groups have the same size:
[root@dude ~]# lvm lvscan
ACTIVE '/dev/data-backup/fileserver' [689,64 GB] inherit
ACTIVE '/dev/data/fileserver' [698,64 GB] inherit
And
[root@dude ~]# tune2fs -l /dev/data-backup/fileserver
tune2fs 1.40.3 (05-Dec-2007)
Block count: 180785152
Since I haven't changed the standard block size of 4K this means we have 723140608 K of data, or 706192 MB or 689,64 GB which is exactly the size of the volumes. So still I wonder what happended to 19GB of space