time your files change, the new versions
of each file will be backed up automatically.
The service will keep three versions
by default, and can be set to keep
up to 28.
These new versions are usually much
smaller than the original file. So
they probably do not use as much of
your storage space as you might think.
Our backup engine compares each new
file to the last version stored. It
then extracts the changed data to
created a "delta" file.
This delta is stored on our servers
as a separate version of the file.
You can later recover the original
file or any of the versions while
only using a fraction of the storage