Lately the backup starts skipping more and more mailboxes.
it started with just 1 or 2 mailboxes but now we are at 103 mailboxes that fail during the backup.
they all give the same error message (Error: Object reference not set to an instance of an object.)
in the log file i find this but i cant find a way to resolve the issue.
I tried editing the job and organisation but it still fails on multiple mailboxes.
21 (2892) Stack:
1/8/2017 9:31:22 PM 21 (2892) at Veeam.Archiver.Source.SyncPage.SaveChanges(IFolderRepository repository)
at Veeam.Archiver.Source.ItemProcessor.ProcessFolder(Byte id, ExFolder folder, Byte currentState)
at Veeam.Archiver.Source.FolderRetry.Process(Action action)
at Veeam.Archiver.Source.FolderRetry.Process[T](Func`1 func)
at Veeam.Archiver.Source.ItemProcessor.Process(ExFolder folder)
at Veeam.Archiver.Source.FolderProcessor.DoMailboxWork(CancellationToken cancel)
at Veeam.Archiver.Source.MailboxAction.DoWork(CancellationToken cancel)