We do not add a limit to the number of websites/databases that you can backup. You are only limited by the amount of space that you need to back up all your websites/databases. You can then buy more storage space as and when required.
Dropmysites's Support team is here to help from 9:00 AM to 7:00 PM SGT, Monday through Friday.
Email support@dropmysite.com and we'd be glad to help with all your questions