fsck-backend software package provides virtual package provided by xfsprogs, ufsutils, you can install in your Debian 7 (Wheezy) by running the commands given below on the terminal,
$ sudo apt-get update $ sudo apt-get install fsck-backend
fsck-backend is installed in your system.
Make ensure the fsck-backend package were installed using the commands given below,
$ sudo dpkg-query -l | grep fsck-backend*
You will get with fsck-backend package name, version, architecture and description in a table
| Distro | Debian 7 wheezy |
| Section | Virtual packages |
| Package | fsck-backend |
| Version | |
| Description | virtual package provided by xfsprogs, ufsutils |
| Sub Section | virtual |