split scp of backup files to different smb shares based on date - linux

Question

I backup files to Tar files once a day and grab from our Ubuntu servers using a backup shell script and put them in a share. We only have 5TB shares but can have several.
At the moment we need more as we backup 30 days worth of Tar files.
I need a method where the first 10 days go to share one, next ten to share tow, next 11 to share three
Currently each Server VM runs the following script to backup and tar folders and place then in another folder ready to be grabbed by the backup server
!/bin/bash
appname=myapp.com
dbname=mydb
dbuser=myDBuser
dbpass=MyDBpass
datestamp=`date +%d%m%y`
rm -f /var/mybackupTars/* > /dev/null 2>&1
mysqldump -u$dbuser -p$dbpass $dbname > /var/mybackups/$dbname-$datestamp.sql && gzip /var/mybackupss/$dbname-$datestamp.sql
tar -zcf /var/mybackups/myapp-$datestamp.tar.gz /var/www/myapp > /dev/null 2>&1
tar -zcf /var/mydirectory/myapp-$datestamp.tar.gz /var/www/html/myapp > /dev/null 2>&1
I then grab the backups using a script on the backup server and put them in a share
#!/bin/bash
#
# Generate a list of myapps to grab
df|grep myappbackups|awk -F/ '{ print $NF }'>/tmp/myapplistlistsmb
# Get each app in turn
for APPNAME in `cat /tmp/applistsmb`
do
cd /srv/myappbackups/$APPNAME
scp $APPNAME:* .
done
I know this is a tough one but I really need 3 shares with ten days worth in each share
I do not anticipate the backup script changing on each server VM that backs up to itself
Only maybe the grabber script that puts the dated backups in the share on the backup server
Or am I wrong??
Any help would be great