After recently transitioning to Ubuntu, I found that my previous online backup solution had some issues running in Linux, even via a Windows XP virtual machine in VirtualBox. With some additional research, however, I came across Digital Lifeboat:
Digital Lifeboat is still in beta. So, the software has had some hiccups, but overall, it has worked fairly well. Digital Lifeboat won’t presently backup directly from a shared system folder in VirtualBox, but syncing the shared folder to a local folder within the virtual machine itself does let Digital Lifeboat read the folder and run the backup. Perhaps the service’s greatest advantage, however, is that users who sign up during the beta period receive free, unlimited storage for the life of their accounts.
For day-to-day archiving and file sharing, Dropbox still has some advantages over Digital Lifeboat. But, something like a Zotero directory of about 6 GB will eat into even an expanded Dropbox allotment very quickly. So, if you’re needing an online backup solution for a large amount of data, signing up for Digital Lifeboat during the beta period is certainly cost-effective and may be worth a look.