Cloud based based backup services are very attractive. All you do is install a small client on your computer and all your data is mirrored to an off-site location to protect you in the event of a disaster. While this is an incredibly practical and useful model, there are a few considerations which have to be made before you subscribe to one of these services. Mainly the amount of data you have as well as your upload bandwidth speed.As this article goes into good detail, but I will give the brief overview. When backing up data, you probably include everything in your "My Documents" folder as well as your respective email storage folders. If these folders are massive, then odds are it going to take a long time to sync. It is important to remember that your advertised internet speed is your download speed with upload speed typically being a fraction of that (test it here). Because of this, your initial sync may take upwards of weeks to complete. Remember, if your upload speed is 1 Mb/s, this means megabit (not megabyte) so the megabyte speed would be 1 Mb/s / 8 = 125 KB/s (.125 MB/s).Just something to consider.