BackupsResearch » History » Revision 4
Revision 3 (Denis 'GNUtoo' Carikli, 09/09/2019 09:38 PM) → Revision 4/25 (Kurtis Hanna, 09/09/2019 10:01 PM)
h1. BackupsResearch
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h2. Doing the backup of partitions or other block devices
h3. adb shell cat pipe
"Old versions of the EFS backup instructions":https://redmine.replicant.us/projects/replicant/wiki/BackupTheEFS/17 used the following command:
<pre>
adb shell "cat /dev/block/platform/*/by-name/EFS > /EFS.img"
</pre>
At some point or under some condition, this stopped working and the backup were corrupted.
h3. adb shell cat adb pull
<pre>
adb shell "cat /dev/block/platform/*/by-name/EFS /dev/block/platform/*/by-name/EFS" > /EFS.img" EFS.img
adb pull /EFS.img ./
</pre>
Doing in in two stage like that seem to be widely used in other instructions (like the ones found in XDA forums).
Normally cat should produce a valid backup, however it might be better to use dd for extra safety.
On Replicant 6.0 0004, the recoveries for the following devices have 'dd':
* Galaxy Nexus
* Galaxy SIII
h3. adb pull the block device
The following should also work:
<pre>
adb pull /dev/block/mmcblk0p3 ./EFS.img
</pre>
The advantage is that taht it can also backup huge partitions like the user data partition or Replicant system partition.