That's what's supposed to happen but there were problems excluding certain file types so they fixed that but started it from scratch so we have approx 90GB being compressed to 45GB and uploaded but it could take up to 8 weeks meanwhile anything done between the start of the backup and when it finishes won't be backed up until it's finished.
Should be sorted now, the company providing the backup are coming out to copy the files on to a hard drive and upload them on to the offsite backup server.