By the 'mask' text boxes you can filter the listed files. Filter can be:

• Positive : use wildcards to "shrink" the files you want to copy according with your mask. No blank spaces.
• Negative : starting the text mask with '!:' (exclamation mark + colon). To restore a lost folder without to copy previous versions of a backup, if present). Wildcars are not allowed, only simple text after first two chars. No blank spaces.
  

Positive filters

May be you don't want to copy all the files of a folder, but only files with certain names or certain extensions. Or may be you want to copy from the same starting path images in a destination folder and movies in another destination folder.
At this purpose you can use the "copy mask" text boxes and the wildchars:

*	Zero or more characters
?	Exactly one character, whatever it is

Some examples od mask:

*	the most generic mask char: copies all available files (also those without any extension)
*.*	copies all files that have an extension (any name and any extension)
*.j*	copies files with any name and extension that begins with 'j' (jpg, jpeg)
d*.*	copies all files that begin with 'd', any extension
*.avi	copies only files with the exact 'avi' extension
???.*	copies only files with name three chars long, any extension
??mov.mkv	copies only files with file name like '21mov.mkv', 'Xymov.mkv'

This allows you to transfer files from a single starting folder to more specific backup folders (images in one, movies in another etc, simply inserting in different rows the same starting path with different masks). Something like:

Negative filters

Simple example:

• mask = "*.txt" ... you firstly list and then copy only text files
• mask = "!: .txt" ... you firstly list and then copy only files that ARE NOT text ones (no wildcards allowed here!)
• mask = "!: [BKU" ... to skip files that contains this text, in case of restore of a lost folder

The main purpose of this feature is to avoid to recover also the possible unwanted previous backup copies of a file present in the backup folder, in case of recovery of a loss starting folder.

Filtering files by mask= '!: [BKU'... for each file of the folder you will recover only the last saved copy of the file, avoiding related backup copies. No overwriting problems, since saved files can't be newer of starting files.