Limit to the size of the back up CBU ?

Hi Folks
I’m using the Comodo Back Up Utilty (4.1.2) to back up my family photos onto a external drive.
The total size of all my pics is about 87gb.
Is this too much to ask ?
Maybe I should do it in steps?
Its been running now 4 hours, the back up cbu size is now 14gb and counting.
Or am I worrying unnecessarily?

Your worring unnecessarely.
The maximum limit for cbu backup is 8 EB = 8 * 1024 * 1024 * 1024 GB


great thanks!