Impossible to restore backup

Hi, here is the log, i’m restoring from a backup tar gz :

Running nc-restore
check free space...
extracting backup file /home/a/nextcloud.tar.gz...
restore files...
DATA CONFLICT! Your old '/var/www/nextcloud/data' directory can be found in '/var/www/nextcloud/.data_2024-06-22T1719071403' after the restore script is done. The new '/var/www/nextcloud/data' directory will be restored from the backup. You can manually merge these directories with this command (run nc-fix-permissions and nc-scan afterwards): cp -rn '/var/www/nextcloud/.data_2024-06-22T1719071403/'* '/var/www/nextcloud/.data_2024-06-22T1719071403/'.[!.]* '/var/www/nextcloud/data/'
Restoring old '/var/www/nextcloud/data' to '/var/www/nextcloud/.data_2024-06-22T1719071403'...
restore database...

what is this type of error please, i don’t understand what to do

thanks

This is a normal behavior. It is telling you “Hey there is already something where you want to push your data so I made a copy on this place”.
As you can see it continues with restoring.