You can install the DropBox software for free on your system after downloading the installer from the DropBox website.
There are two ways to backup your InBloom Data. Please note that this
is only to be used to create a spare and safeguarded backup copy of
your data and not to be used as a way to share your data in realtime
with other users. InBloom can share your data using FileMaker Pro on
your local network (read how here and here).
click Backups (the umbrella icon in the top toolbar)
Make sure Backup Frequency is set to a value e.g. Everyday
Make sure Backup Type is set to a value e.g. Full Backup
click the Choose Secondary Location button and
specify your Dropbox folder. The path to your Dropbox folder will be
entered in the field e.g. /Volumes/Mac HD/Users/Janet/Dropbox
You can click Perform Backup Now to test creating a backup. The Dropbox icon in your menu bar should switch from a green check box to a blue spinning arrow to indicate that a copy of your data is being sent to the Dropbox servers.
You are good to go. Anytime you logout of InBloom, a new backup will be sent to Dropbox.