Backup Excec suddenly not overwriting tapes
I'm using Backup Exec 2010 and am backing up to tape. I have the backup set to append and if not appendable to overwrite. I have no overwrite protection on the tapes and they're all set to be appendable.
My backups have been working fine up until recently where the last few have asked me to insert overwritable media just as they start. Nothing has changed so I'm unsure as to why my tapes have suddenly become non-writable. As I've said, all my settings are the same so I'm not really sure what to check.
Any help would be appreciated.