Real Time: is when something is done in the moment....like 'real time" AV protection....it protects as it's happening.
I would just go with basic sync.....unless you're making 50 changes to the system every hour.....real time sync is not needed and will just work your system endlessly. I would go basic sync and then set the backup as daily or depending on the changes that you make to the system....even a weekly backup.
The bottom line is what ever makes you happy and comfortable doing.
As I stated in post #8, Windows has a built in backup. With this thread.....I set it up at that time and set it to back up daily. I would have went with weekly but only daily or hourly, and minutes are the choices. All it backed up was my data and that went on a external drive. So if my OS crashed and broke....I would still need to re-install or clean install the OS. Then just add my data. It's quite simplistic but functional.