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BackupsResearch » History » Revision 4

Revision 3 (Denis 'GNUtoo' Carikli, 09/09/2019 09:38 PM) → Revision 4/24 (Kurtis Hanna, 09/09/2019 10:01 PM)

h1. BackupsResearch 

 {{>toc}} 

 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.