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BACKUP1 AB
Not possible

Convert BACKUP1 to AB

Can you convert BACKUP1 to AB?
Verified by Adam B.· reviewed by FE Editorial ·updated Aug 22, 2026
QUICK ANSWER
Is it possible to convert BACKUP1 to AB?
No - not a direct conversion.

A .backup1 is a 2 GB split chunk of an Android on-device system-recovery backup, while .ab is a separate ADB backup archive; neither can be rebuilt into the other. Instead of converting, just restore your data with the matching tool and, if you want an .ab, create a fresh backup with ADB.

No direct path

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Tested on macOS, Windows & Linux
Last verified Sep 2026

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Why convert BACKUP1 to AB?

.backup1 is one piece of a device's built-in split recovery backup stored on the SD card, whereas .ab is an Android Debug Bridge backup (a TAR with modified headers) made from a computer. They are produced by different mechanisms and hold data in incompatible layouts, so a direct conversion is not possible.

How to convert BACKUP1 to AB

Restore .backup1 via System Recovery FREE

Boot the Android device into System Recovery (hold power plus volume) and choose the restore-user-data option to read the .backup/.backup1 set.

Create a fresh .ab with ADB FREE

With USB debugging on, run adb backup -apk -all -f backup.ab from a computer to produce a genuine .ab archive of the device.

Restore an .ab with ADB FREE

Use adb restore backup.ab to push an existing ADB backup back onto the Android device.

About these formats

.BACKUP1 Split Android Recovery Backup File (part 2)

A .backup1 file is the second part of a split backup created by an Android phone or tablet in System Recovery Mode. When the userdata backup is larger than about 2GB, the recovery splits it…

Open .BACKUP1 details →
.AB Android Backup file

An AB file is an Android backup produced by the Android Debug Bridge command "adb backup". It stores app data in a compressed, optionally encrypted archive. To read it on a PC, convert it…

Open .AB details →

Quality & what to watch

  • The two formats come from different backup systems, so files inside a .backup1 cannot be repackaged into a working .ab.
  • .backup1 is typically restorable only on the same device model through its recovery menu.
  • .ab files are often encrypted with a user password, which is required for any restore.

Frequently asked questions

Can I turn a .backup1 into an .ab file?
No. They are separate, incompatible Android backup formats with no conversion path between them.
How do I get my data out of a .backup1?
Restore it through the device's System Recovery mode; it is not a portable archive you open on a PC.
What is an .ab file then?
It is an Android Debug Bridge backup, a TAR-based archive created from a computer with the adb backup command.
Is there any app that bridges the two?
No reliable tool does this; the practical route is to restore your data and make a new backup in the format you need.