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.
Fullbay - Fullbay is built for HD repair shops & fleet managers. It improves tech efficiency, bills parts, and makes invoicing a snap.
Dropbox - Online Sync and File Sharing
Shopmonkey - Shopmonkey - The #1 Auto Repair Shop Management Software for Mechanics, Auto Repair Shops, Motorcycle Shops, Truck Repair & Body Shops. Start a FREE trial!
Google Drive - Access and sync your files anywhere
Mitchell 1 - Mitchell 1 is a leader in providing automotive repair software and repair shop solutions that simplify everyday tasks for automotive professionals.
Mega - Secure File Storage and collaboration