Perl script to find new files and compress those new files

Hi - My other software dumps files in the one folder (example: folderA)
Now I want a script that consistently watch this folder (May be once in 15min) to find new files and compress those new files and copy it to different folder with timestamp.

Example: FolderA contains the below files
1) testfile1.txt
2) testfile2.txt

FolderB already contains the old files
1) testfile1_09152016_121066.txt
2) testfile2_09152016_121066.txt
3) testfile1_09142016_121066.txt
4) testfile2_09142016_121066.txt

Now I want to check whether testfile1.txt is new file or not by comparing with the latest files from folderB
like comparing testfile1.txt with testfile1_09152016_121066.txt and if it is different then rename testfile1.txt with timestamp and copy the file to folderB after compressing it.
The size of the file is so big, its 1GB min and 4gb Max.
so can't compare the actual content in the file.

So can someone help me how to identify new files and compress them.

Thanks,