I have unfortunately found out recently that iDrive is useless.... I had my laptop stolen and relied on iDrive for a backup. As it seems, iDrive had not been correctly backing up even though it stated each day it was successful. I managed to get a partial restore however many important files were either missing or corrupt. I checked all past 10 revisions and every single one of them was the same. It turns out the past 6 months data has issues.
To make matters worse, support has been completely unhelpful. It takes a week or more to receive a response, if at all, and each time I have been provided with generalised information that is completely irrelevant to my issue. On top of that I have been informed that any missing files are only kept for 30 days and it has now been well past this timeframe due to the slow response time. I hope this experience serves as a warning to others to avoid similar issues. I will definitely be changing to another online backup solution and urge others to do the same.