tar only files that have a certain number in filename.

Hi all.

I'm not a pro yet with command line so i wanted to ask here incase i mess anything up with my centOS server.

I have a folder on my server that plesk puts its website backups in:

/var/lib/psa/dumps/

Within this folder it has loads of random backups and configs files along with a folder named domains that holds all the individual backups for each domain that plesk is hosting.

A backup is done weekly and the dumps just keeps storing more clutter.

every month i would like to download only the files that match the latest backup. (for safe keeping)

When a full server backup is done i can see its unique number inside the plesk dashboard. This number is also appended to the end of each backups file name.

So my thoughts are to copy all the files found in dumps/ and its subdirectories that have the unique number in the file names over to a .tar archive.

Then i can simply download the tar each time i need the latest backup.
I have searched online and found this command:
find ./ -type f -name "*.txt" -exec tar uvf myarchives.tar {} +

My unique number for the last backup is 1404190251
This is how all the files names are formed:
weeklyBackup_admin_angela_1_1404190251.tgz
weeklyBackup_angela-wright.com_apache-files_1404190251.tgz
weeklyBackup_angela-wright.com_info_1404190251.xml
and so on...

how can i modify the command so that it grabs these files with the number in the center of the filename as they all have different file extensions. Do i just add a * at the front and back like this?:
 "*1404190251*"

and will this command do a copy or will it remove the files after adding to the tar archive?
i would like to keep the old files in place if possible.

Thanks.