For hosting common files it's ok. Also it is on Android too do, great to transfer files between your Windows and your phone. But if you want better security you have to subscribe a monthly offer.
Dropbox - Online Sync and File Sharing
Yardi Voyager - Voyager is software for managing properties and the people who live there. The software is developed by Yardi, a company founded in 1984 that specializes in property management software. Read more about Yardi Voyager.
Google Drive - Access and sync your files anywhere
AppFolio - AppFolio is the premier online property management software for modern residential and rental property managers. Try it free today.
Mega - Secure File Storage and collaboration
Building Engines - Property management software for commercial real estate work orders, preventative maintenance and inspections.