CloudBacko is a cloud storage Sync utility that lets you pool up multiple Google Drive accounts and multiple OneDrive accounts, all under one app, as a single large cloud drive.
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Pro Several cloud storage services supported
Amazon Cloud Drive, Dropbox, Google Cloud Storage, Google Drive, Microsoft Azure, Microsoft OneDrive, OpenStack and several others are supported.
Pro The FREE version lets you test it for a month before deciding.
The free version has some limits, but it will let you test a lot of features before deciding to buy it or not.
Pro You can back your virtual machines in the cloud as well
The PRO version has support for backing up VMware guests, and (unofficial) support for other virtualization software as well.
Pro It can backup database servers as well
It supports backing up Oracle Databases, Microsoft SQL Server databases, Microsoft Exchange servers EDBs, IBM Lotus Domino databases, etc.
Pro It can secure your files
Files and folders can be encrypted with AES/Twofish/DESede 256 bit algorithms.
Pro It can test your connection individually
It can test each cloud storage to ensure it's active and available.
Con Users may have trouble logging in even after multiple social authorizations
Con Slow software and several bugs have remained for years
According to this review site, users who have used it, complained that this software is lacking in speed and that several bugs have remained unsolved for the duration of several releases, so the app has a few quirks every now and then.
Con Greedy updates policy
Once you buy the product, updates are only free within a major release, which means that once they get a new major release out there, the old one will continue to work, but you should buy the new product to get the most of it.
Con Ugly Windows 8-like user interface
This might be a pro for some, but most people don't like the Windows-8 colored theme and think it's both confusing and a waste of space.