diff --git a/pages/04.other/20.android/01.adb/default.en.md b/pages/04.other/20.android/01.adb/default.en.md
index 87e7073..f8c219d 100644
--- a/pages/04.other/20.android/01.adb/default.en.md
+++ b/pages/04.other/20.android/01.adb/default.en.md
@@ -11,6 +11,12 @@ The easiest, and probably intended way to copy files using adb can be seen in th
 The exmple here makes a copy of all content in "sdcard", the user's data directory.  
 
 ### Compressed backup
+> [Stackoverflow answer](https://stackoverflow.com/a/39429196)  
+
 Using this command, a backup can be pulled as well. This time however, it is passed to zstd for compression.  
 Tar on the phone doesn't do much except go through all files and send them to the terminal's STDOUT. All the compression happens on the host.  
+*All data has to be transfered first. very slow with USB 2.0*  
 `$ adb exec-out "tar -cf - /sdcard/* 2>/dev/null" | zstd -19 -T16 -v -o sdcard-2022-11-18.zst`  
+
+*this actually works*  
+`$ adb exec-out 'GZIP="-9" /system/xbin/busybox tar -czf - /sdcard/*' > sdcard.tar.gz`