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Date:      Sat, 17 Feb 2018 19:25:53 -0500
From:      "Peter A. Giessel" <pgiessel@mac.com>
To:        Ralf Mardorf <ralf.mardorf@rocketmail.com>
Cc:        freebsd-questions@freebsd.org, galtsev@kicp.uchicago.edu
Subject:   Re: File fransfer from iPad to FreeBSD
Message-ID:  <30404453-D006-4F54-B9A9-2399CC3366FD@mac.com>
In-Reply-To: <20180218004656.6e2197d0@archlinux.localdomain>
References:  <20180216104703.555e9987.freebsd@edvax.de> <44df8585-9874-2614-590a-bea78f54caa4@kicp.uchicago.edu> <A5183971-4781-4463-98FB-73BE1062B105@kreme.com> <54570.108.68.161.195.1518893084.squirrel@cosmo.uchicago.edu> <20180218004656.6e2197d0@archlinux.localdomain>

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> On 2018, Feb 17, at 18:46, Ralf Mardorf via freebsd-questions =
<freebsd-questions@freebsd.org> wrote:
>=20
> Apple should allow to make backups. Actually what they call a backup
> via iTunes is not a backup. They don't backup all apps, they just =
store
> some purchased meta-thingy and there even is no backup of data
> available. If you accidently deleted an app with some important data,
> reinstalling the app, if possible at all, doesn't bring you back the
> lost data, a sync with an iTunes "backup" would require to manually
> restore data by the file sharing option, but not all apps support file
> sharing, IOW here is no way to backup all user data.

The above statement is false.

I got a new phone that never had my user data on it before.  I restored =
it from backup.  The new phone had all my app data on it.

It was only missing the device password (which needed to be set for the =
new device anyway) and my TouchID hash because that is stored in the =
processor and cannot be copied off the device.  Ralf=E2=80=99s statement =
above is demonstrably false.

I understand the chafing at the closed system, but don=E2=80=99t make =
false claims.

Ralf is correct that iCloud backups do not contain the full app.  They =
instead contain the incremental diff between the current state of your =
app with your app data and the original.  This dramatically reduces the =
bandwidth used in backup, just like many of us use rsync for the same =
reason.  Why would Apple send the whole app back to their servers when =
they already have it?  They can just send the diff like rsync does and =
dramatically reduce the storage and bandwidth load.=



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