To put it simply, backups and disaster recovery plans are insurance for your business data. Consider the value of the data stored on your devices and how much you would be willing to spend to get it back if someone stole it or something destroyed it. Would your business be able to recover without the ability to ever access this data?
Anecdote: We've received a call from a small business asking if we could restore their accounting data (most critical among the rest of their data), after water sprinklers triggered due to a burning toast in the toaster. That flooded their office both their server and storage units were damaged. They had no backup. The cost for getting an estimate or simply attempting to restore those hard drives was more than they could afford. The business was closed.
In most cases, investing a tiny percentage of your business data's estimated value is more than enough to implement a disaster recovery plan that includes offsite backup. That's a necessary insurance that will allow you and any IT provider to sleep better at night, and recover if the unexpected happens.