Sorry, not possible. There's no concept of scanning an optical Destination for comparison purposes before deciding what to copy (it's assumed the discs will be blanks, and RW discs will be erased to make them so). Any backup set made by raw optical burning is thus stand-alone / one-time (except that RW discs can be erased for re-use). It will always copy every Source file that is not otherwise excluded by filters, de/selections, age/size limits, etc.
There's also no concept of stopping a multi-disc burn job and resuming it, except using Pause (and that's not too stable). There's certainly no functionality that would survive a program restart (or reboot).
You could try making ISOs of what will be the disc(s) content(s) - which should be much faster - if you have the space, and then transferring an ISO to a BD-R each time you're present and have the time (and the stability problem would mean any outage would only costs you a spoilt disc and not abort the entire operation). But you'd need 3rd-party burning software to do the 2nd-stage. SyncBackPro can't read or restore from ISOs.
Even if you succeed in getting all current files onto BD-Rs, there's no way of making fresh backups that don't include stuff already backed up (stored) on a previous set unless you use some kind of age-filters, etc, to limit what is copied on future runs.
It's not clear which version of Windows you're running (I assume not Win8 yet...) but if you're planning to upgrade, you should bear this in mind:
http://support.2brightsparks.com/knowle ... -windows-8
There's also no concept of stopping a multi-disc burn job and resuming it, except using Pause (and that's not too stable). There's certainly no functionality that would survive a program restart (or reboot).
You could try making ISOs of what will be the disc(s) content(s) - which should be much faster - if you have the space, and then transferring an ISO to a BD-R each time you're present and have the time (and the stability problem would mean any outage would only costs you a spoilt disc and not abort the entire operation). But you'd need 3rd-party burning software to do the 2nd-stage. SyncBackPro can't read or restore from ISOs.
Even if you succeed in getting all current files onto BD-Rs, there's no way of making fresh backups that don't include stuff already backed up (stored) on a previous set unless you use some kind of age-filters, etc, to limit what is copied on future runs.
It's not clear which version of Windows you're running (I assume not Win8 yet...) but if you're planning to upgrade, you should bear this in mind:
http://support.2brightsparks.com/knowle ... -windows-8