Ubuntu Servers :: Backup Script To Check If A Path Is Mounted?

I'm writing a script to rsync some directories to external hdd for backup.

My external hdd gets automatically mounted to /media/backup1

My script then backs up predefined directories to /media/backup1.

I have added this script to cron to run once every day.

The problem is that in the case where the drive is not plugged in and the script runs, it backs up to my local hard drive, and since it is more than 70% full, it fills it up by duplicating that 70% onto itself.

I have taken the script further, to test whether /media/backup1 is mounted. If it is, the backup will run. If it is not, it will bail out.

I'm using the mountpoint program to test for mounts.

My script so far:

Code:
#!/bin/bash
if [[ `mountpoint /media/backup1` ]]; then
echo "filesystem mounted"
# The backup function. Commented out for testing.

[Code]....