Add external backups. One to keep in your desk, one to keep at home, one to keep in another secure location. More in separate locations as needed for your comfort level. And just as important, do a test disaster recovery at least once a year to make sure you really can restore from a backup, even on a new computer. This includes not only restoring from your backup, but reinstalling needed software. If you do not test the process, you will undoubtedly find gaps in the needed information/knowledge. Do not rely on a computer "expert" for this process. It MUST be you. YOU are the only one who really knows what you will need.
Example. Customer had a computer failure. Sent drive off to a high dollar recovery service. Waited. Got a drive back with whatever was able to be recovered. There were no instructions showing how to use what was recovered, so the person, so far, has not been able to make proper use of the recovered information. Could be what was needed was not actually recovered at all. A large amount of time and money spent with no results. The time and expense was well over what it would have cost to hire someone to recreate the missing data.
Only YOU can prevent data loss...