InDesign file extensions are *.indd, *.indb, *.indl (settings) *.idlk (templates) *.indt and it is usually stored in My Documents folder.
Read more about automatic My Documents backup with Novosoft Office Backup.
You can also specify Adobe InDesign file extensions in Step 2 of the New Task Wizard: What to back up (Expert Mode) and Novosoft Office Backup will find and backup all files automatically.
Go to program settings backup
See also: E-mail backup, Messengers backup, MS Office backup,
Registry backup, My Documents backup, Desktop backup, Favorites backup, Documents backup