How to restore a database?

Hello,
I am testing how to make an incremental backups for a single innodb database and how to restore it. I am having difficulies with restoring the database. Here is my steps:

1 - Creating full backup ./xtrabackup --backup --target-dir=/home/backup/base --databases=db1

2 - creating incremental backup after changing some rows ./xtrabackup --backup --target-dir=/home/backup/inc --incremental-basedir=/home/backup/base --databases=db1

3 - Preparing :
./xtrabackup --prepare --apply-log-only --target-dir==/home/backup/base

./xtrabackup --prepare --apply-log-only --target-dir==/home/backup/base --incremental-dir==/home/backup/inc

Now after running these commands, I found a new folder called backup inside the data folder. The folder contains the following files:

ibdata1 xtrabackup_checkpoints xtrabackup_logfile

I stopped at this point, what should I do know?
For testing ,I stoped MySQL and removed the existing database folder db1 and the file ibdata1 inside the data directory and then I cpoied the ibdata1 from the backup folder to the data directory and started MySQL but I did not work.

Thanks for help :)