There aren't any options to delete duplicate files or compress the files to save space on your drive. FreeFileSync Portable doesn't offer many ways to customize your backup, other than choosing to mirror the backup or select certain folders.

In addition to choosing any folder on your computer, you can choose an attached drive or memory card, if you want. This program gives you two separate drop-down lists: one to choose the folder of files you want to copy and another to choose the destination folder. It makes it easier to carry them on a portable drive, after all. That's not massive by any means, but portable programs tend to be less than 1MB. Though this includes portable right in the name, it checks in at 24MB.

Still, if you just want a slightly better version of Windows' drag-and-drop system, this program will probably meet your needs. FreeFileSync Portable lets you compare and synchronize files and folders, but it doesn't offer much in the way of advanced goodies as there's no way to compress, re-organize, or clean up your files as you're copying them.

Free for ios download FreeFileSync 13.0