Comodo Backup is free online backup, sync and storage solution for Windows and it is one of the best alternative to dropbox.
Free Plan: 5 GB free online storage space
Main Features:
Smart Profiles
Easy to use interface
Versatile scheduling
Incrementals & differentials
supports Network drive, external drive, FTP, DVD/CD, ISO, zip, online storage
Command line & scripting
Autocomplete backup name
Burn to cd/dvd/bd
Volume shadow copy compatibility
Junk file scanner
versioning capabilities to keep track of your backup changes.
Online Drive
System requirements
Operating Systems: Windows XP x86 SP2, Windows XP x64 SP2, Windows Server 2003 x86, Windows Server 2003 x64, Windows Vista x86, Windows Vista x64, Windows Server 2008 x86, Windows Server 2008 x64, Windows 7 x86 or Windows 7 x64
Hardware:Intel Pentium II 233 Mhz or better
