Marking Files
At the heart of TagNBag is the ability to simply select the files you
need backed up, using the same methods you use to view them, i.e.
Windows Explorer.
Mark a file
To mark a file, you simply open Windows Explorer to the directory containing
the file you want backed up, select it, then do a right mouse click
(RMC) to bring up a Context Menu. The TagNBag shell extension causes a new menu item to appear: Mark for backup.

Marked Icon
Clicking this menu item causes the selected file to be included in any
subsequent backup performed by TagNBag. An icon is shown in the
lower right hand corner of the marked file to indicate that it will be
part of a backup.

Unmark a file
You can remove the mark on a file by selecting it and doing another RMC. The context menu will now have an item saying Unmark.

Mark a directory
You can also mark a directory just as you would a file. This
causes all the contents of the directory to also be marked. This
includes the subdirectories contained in the directory, and there
contents, recursively. Subsequent backups will include all these
files. Alternatively, you can Exclude a contained file or directory
from the backup set.
You can also unmark a directory just as you would a file. All the marked contents in the directory will also be unmarked.