One of my customers required a solution that made reliable backups and copies of a Microsoft Access database. The backups had to be accessible from three Windows machines.
I first had a look at the different cloud solutions.
Both Dropbox and Google Drive are valuable candidates. When you use these solutions it is important to have a look at their ToS to verify that they comply with your policies. A post on ZDNet can help you to compare some of the agreements.
If you bring in BoxCryptor some of the worries you have with “what can they do with my files” go away as this introduces encryption.
I’ve now configured their main system with a script to xcopy all new files to the crypto container upon boot. This then gets synced to Dropbox and becomes available on all the other systems.