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Dropbox, Box, Google Drive, SkyDrive
"Dropbox" and "Google cloud drive" are good sharing and backup online services
also DELL have there online backup services. i hope this help you
i'm using skydrive
use the offline , it`s better
For Business use its better to check a service which support encrypted storage. Its someone personal choice according to their needs, Please check the following link for comparison between differenct services and select one according to your needs
http://en.wikipedia.org/wiki/Comparison_of_online_backup_services
We can choose services depends of the data and priority.
Dropbox, Google Drive, Skydrive are offering free services with space restrictions similarly we can purchase extra space from following vendors. All this are good for personal purpose.
For company purpose, use some premium services similar like AWS, etc.
google drive ( I use it ) . dropbox skydrive and4 shared
Is better to use online and offline backup to be sure . for online SkyDrive,Dropbox, Google Drive, Backblaze, CrashPlan, Carbonite
Google drive, cloud, dropbox, twitter, linkedin