nfs mount problem

Please I need help. I'm trying to mount  a shared volume but i'm having volume swap

From the server side:

[root@exabkp etc]# df -h
Filesystem            Size  Used Avail Use% Mounted on
/dev/mapper/vg_root-lgvol1
                       30G  3.1G   25G  11% /
/dev/mapper/vg_root-lgvol3
                       20G  226M   18G   2% /var
/dev/mapper/vg_root-lgvol4
                      9.7G  151M  9.1G   2% /home
/dev/sda1             487M   41M  421M   9% /boot
tmpfs                  12G     0   12G   0% /dev/shm
/dev/mapper/vg_backup-lvbackup
                      5.8T  5.5T  1.6G 100% /backup
/dev/mapper/vg_bkup1-lvbkup1
                      5.8T  184M  5.5T   1% /backup1



[root@exabkp etc]# more exports
/backup 192.168.10.1(rw,no_root_squash,fsid=0)
/backup 192.168.10.2(rw,no_root_squash,fsid=0)