Time required to back up file or virtual machine images to cloud storage largely depends on the upstream bandwidth. As virtual images file size can go up to few hundred GB, and the first-time upload will be a full image backup, the upload time required can take a few days. It will be nice for system admin to know in advance the required time for initial upload.
Using the online file transfer calculator can easily give you a clear picture when you plan the backup schedule. You only need to input a few metrics to start with.
For example, if one needs to back up 1TB data using 10MB/s upstream with 50% overhead, the initial backup job will take 43 Hours, 41 Minutes and 26 Seconds, which is slightly less than two days. If upstream is limited to 10mbit/s with 50% overhead, the initial backup job will take 349 Hours, 31 Minutes and 31 Seconds. That is about 14.5 days, slightly more than two weeks.
|1TB||10MB/s||50%||43 Hours, 41 Minutes and 26 Seconds|
|1TB||10mbit/s||50%||349 Hours, 31 Minutes and 31 Seconds (2 weeks)|
Once the first backup job has completed, subsequent backup would takes much less time if you have enabled in-file delta settings using incremental or differential settings.
When you plan your cloud backup implementation, take note of the bandwidth requirement. Use the online tool to estimate upload time required.