Backup and Migrate - create a short description

Added a proposed short description derived from the first sentence of the full description.

Tagged as DrupalCon Lille 23 and Novice

We, the mentoring team, are triaging issues for first time contributors at DrupalCon Lille and I think this is a good issue for the contribution day.
We are reserving this issue so please don't work on this issue if you are not at DrupalCon Lille. You can continue the work when the event is over.

Link to the detailed page of the module added to the issue summary.

Modified the description, to make it more informative and easy to read.

Clear description. 150 characters.

Assigned credit and marked as fixed.

Automatically closed - issue fixed for 2 weeks with no activity.