"Compression" page appears only if the Full mode was selected at the first page of the section creation wizard.
It allows you to set properties of ZIP-files created by Backupper.
"Backup comment" allows to set a comment for the section backup file. Maximum length is 255 characters. Leave empty if you do not want any comments.
"Compression ratio" sets the compression level of the backup. Possible options are: no compression, fast (large size), normal, slow (minimal size). The smaller is the backup file in the result the longer it will take to create it.
If "No compression" is selected the files will not be packed at all. Speed is highest but the backup can have larger size than the source data files (ZIP-header is added). It is not recommended that you select this option unless you include in the backup already packed files which could hardly be compressed further.
"Password" field allows to protect backups with password. Maximum password length is 80 characters. Leave empty if you do not want password protection.
See also: Creating and setting up sections.