I have a device with a broken display. The only way I can initiate commands on it are with the power, volume, and home buttons, and with adb. I've installed TWRP on it, and I'm able to boot into it. I'm trying to back up everything on the device I can to a 32GB SD card in the device's SD card slot. But when I keep getting the following result:

~ # twrp backup SDBOM

Setting backup options:
Compression is on
Digest Generation is off
Updating partition details...
 * Total number of partitions to back up: 3
 * Total size of all data: 7976MB
 * Available space: 496MB
Not enough free space on storage.
Backup Failed
Done processing script file

The SD Card has more than enough space for the backup (several times over, in fact), so clearly TWRP is attempting to save the backup to the device's internal storage. I've heard tell (I'm afraid I can't find the link right now) that twrp backup in the command line saves to the Storage last selected in the graphical version, but since my device's display is broken I can't select the SD Card as the storage for the backup.

Since I have no display, I also can't do adb backup --twrp, since that requires confirmation on the screen.

Is there any way to select the storage for twrp backup fully through the terminal? For example, is there an environment variable I can set, or something I can pass twrp backup?

  • I was always under the impression the twrp and roms wipe the device unless you installed and used it before the screen stopped working. – William Mar 25 '18 at 18:36
  • @William Apparently not! At least not the way I installed it, and on the device (Samsung Galaxy Tab S). – laef Mar 25 '18 at 18:44
  • The recovery partition is completely separated from the system, data, cache, boot etc partitions so flashing a recovery to replace the recovery partition shouldn't interfere with any other partition.. It's recommended that after installing any customizations that you wipe the dalvik cache and cache but i haven't heard of fully wiping the data partition unless flashing an entire ROM ( Firmware ) that'll replace your system, boot, user data and recovery. – Gadget Guru Mar 25 '18 at 20:13

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