Sign up for BackupServices.ca
Unlimited online backup with the service is priced at $10.99/mth per computer. Each computer will run the client software (for which you'll be sent a link) and will be monitored to ensure it's working as expected.
The monthly fee includes backup as well as the ability to synchronize files between computers (limited only by the free space on each device) and the ability to share folders with third parties.
Unlimited technical support is included in the monthly fee.