Delta copying
A couple of words on a feature that is as simple in idea as it is huge in impact.
When updating an existing backup copy of a file, Bvckup 2 detects and skips over
unmodified parts, copying just the actual changes.

Disk writes are expensive and being selective with copying quickly pays off when
working with large files that slowly change between the backups.
* If you are familiar with
rsync,
it's a similar idea. The difference is that Bvckup 2 doesn't require a second
instance of itself to be running on the receiving end, meaning that its delta
copying can be used with any storage facility that provides basic write access.
Here it is in action copying a
10 GB virtual disk of a just rebooted Windows
virtual machine -
Modified blocks
Progress so far
Copied
19 MB out of
10 GB or just
0.2% and completed
in less than
4 minutes vs
19 minutes needed for the full copy.
Here is another example of updating a
256 GB TrueCrypt volume with work files
and about a day's worth of changes -

Copied
1.8 GB out of
256 GB or just
0.7% and completed
in about
53 minutes vs the
4 hours that the full copy would've
required.
Give it a try and see for yourself the difference delta copying makes.