The temporary directory is used for various purposes, such as storage of temporary spooled file (for database specific backup type in Cloudbacko Pro), remote file list, local file list, temporary delta file and other files of temporary nature.
For database backup in Cloudbacko Pro, it is highly recommended that the temporary directory or volume used for these modules is not a system volume (e.g. not the same partition which the operating system is installed on) and it has at least storage space of 150% of the expected backup size.
Administrators need to pay attention to the maximum file size limitation of different file system format, so that database file can be spooled to the temporary directory.