bash script help to check nfs mount exists [rsnapshot]

I have two linux servers; server two is a backup to server one where server two is NFS mounted to server one. I use rsnapshot on server one to copy from /data/ to the **nfs mounted** folder /bkup from server two. Problem is if the nfs /bkup mount isn't there, rsnapshot will copy /data {20tb) onto the root partition {1tb}. Instead of cron'ing my one call to launch rsnapshot I would like to call a backup script that first checks on everything before calling rsnaphot to prevent that scenario. I do not think rsnapshot's no_create_root is relevant because the /bkup folder will always exist. Can the following happen in a bash script? *i'm hoping someone fluent in bash can type it up in 2 minutes? my bash writing is horrible.* if ( showmount -e server_two responds with "/bkup server_two" ) { if ( check if /bkup is nfs mounted == true ) { /usr/bin/rsnapshot daily } else { mount /bkup if ( check if /bkup is nfs mounted === true ) { /usr/bin/rsnapshot daily } } } right now I have this to work where/when my nfs bkup mount is good on server_one mount | grep bkup server_two:/bkup on /bkup type nfs4 (rw,relatime,vers=4.1,rsize=1048576,wsize=1048576,namlen=255,hard,proto=tcp,timeo=600,retrans=2,sec=sys,clientaddr=192.168.1.2,local_lock=none,addr=192.168.1.1) df -h | grep bkup server_two:/bkup 15T 3.0T 12T 21% /bkup showmount -e server_two Export list for server_two: /bkup server_one