I have been trying to back up my secure folder for a while now and each time I try I get an error message saying that the back up has failed. I have searched for help and I seen someone suggested backing up in chunks which I have also tried. It gets to a certain amount then another error message pops up saying Backup failed something went wrong and some data was lost. To avoid losing the data permanently restore your data before trying to back it up again.
What can I do to fix this?