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Android adb “unknown backup flag” problem

Apparently, at some point the syntax for using adb backup changed and it’s not really well documented…

This is how I backed up my Android phone with adb today:

adb backup -f mybackup.bkp '-apk -obb -shared -all -system'

While before you would launch your backup with:

adb backup -f oldbackup.bkp -apk -obb -shared -all -system

Notice the lack of quotes in the old version.

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