How to back up user data from recovery mode? My micromax canvas nitro A311 is stuck in boot loop.I have tried to solve the boot loop problem but couldn't succeed.The only solution seems to me is to format my phone.I am able to go to the recovery mode.It shows the following options:-


reboot system now
apply update from ADB
apply update from sdcard
apply update from cache
wipe data/factory reset
wipe cache partition
backup user data
restore user data


When i select the "backup user data" option ,it shows "SD card  did not have enough free space".It is reading my internal sdcard but not the external one.Is there any way I can back up data on an external sdcard or on my PC?My android phone is rooted.
With the option for update via adb you can likely use adb commands while phone is in recovery and connected to a computer.

first you will need the adb files:
found here

unzip the contents to computer.  I recommend root of drive i.e. C:\adb.

next you will need USB drivers to connect phone to computer and be able to execute commands:
found here

Install drivers via usual windows methods.

got to folder where you extracted adb files
hold left shift key and right click mouse
select open command window here.
connect phone to computer and boot to recovery.
test connect:  

    adb devices


you should get output for server starting and a line showing phones serial number if connection is possible.  

Providing all is well:  

    adb pull /sdcard/.


this should pull all contents on internal sdcard to current directory.

This will NOT retrieve data stored elsewhere such as phone logs or text messages or contacts.  Unfortunately those will be lost without the option to recover from boot loop.  It will only recover data saved on data partition in phone such as photos, music and other misc info saved there by apps.

Try wipe cache partition to see if that gets past boot loop.  only option I can think of.

Or simply flash custom recovery like twrp that allows access to external sdcard
forum.xda-developers.com/a310/orig-development/twrp-recovery-micromax-canvas-nitro-a311-t3066387