I've recently switched our SharePoint 2010 backups from using stsadm to the PowerShell backup-spfarm technique but just have a bit of a worry about differential backups.
Essentially we're running daily full SQL backups of the content database and then weekly full SharePoint backups and daily differentials using backup-spfarm. I've seen before how SQL's backups (through a maintenance job) interfered with differential SQL backups done by 3rd party backup software in that the differential was from the last full, i.e. the last SQL backup, so we have to switch to doing copy backups instead of full by taking it out of the maintenance job and scheduling a separate custom Agent job.
So I'm just wondering if someone can confirm whether SharePoint just uses SQL's built-in tracking of full/differentials (which would mean a problem for us) or whether the two don't interfere for some reason.
I hope to do a test restore using a full SP backup and differential a couple days after the full to confirm but in the meantime I could do with sleeping a bit better!
Thanks a lot!