Backup failing after some time in solaris

Hi Team,

Note: The suggestions I require from OS perspective not from netbackup client/server end.

We received information from the netbackup team that backup are failing after it runs sometime.

They asked to check if there is any filesystem issue.

Please assist what are the different things do I need to check?

 df -k
Filesystem            kbytes    used   avail capacity  Mounted on
/dev/md/dsk/d2       2053605  708995 1283002    36%    /
/dev/md/dsk/d11      4129290 3357687  730311    83%    /usr
/proc                      0       0       0     0%    /proc
mnttab                     0       0       0     0%    /etc/mnttab
fd                         0       0       0     0%    /dev/fd
/dev/md/dsk/d8       3096423 2860866  173629    95%    /var
swap                 7123032      32 7123000     1%    /var/run
swap                  524288   55608  468680    11%    /tmp
/dev/md/dsk/d14      21572485 4681160 16675601    22%    /export

Thanks,