Your client's websites are located onto various platforms spread all over the world?
It is probably time to manage everything from a unique platform, relying on a daily backup and profiting from extra services.
FTP server with 5 GB storage
500 MB HDD, 1 DB (mySQL), 1 subdomain, 1 FTP account
1.5 GB HDD, 3 DB (mySQL), 3 subdomains, 3 FTP accounts.