The following limitations apply to backup plans executed simultaneously.
Multiple image-based backups cannot run simultaneously. On such attempts, only one plan is executed and the rest of the image-based plans are terminated with an error.
You may not expect any issues when running an image-based and file-level backup plan at the same time, or running a SQL Server and file-level backup simultaneously.
However, avoid executing multiple file-level backups since simultaneous processing of source data can occur.
It is strongly not recommended to back up SQL Server database with different backup plans: It is required for the SQL backup chain consistency. As a workaround, create a hybrid backup if you need to back up SQL database to multiple destinations at once.
Avoid performing a consistency check over a storage that serves as a destination for a currently running backup plan.