Follow-up from "WIP: Resolve "Index mappings not preserved in backups""

The following discussion from !36 (merged) should be addressed:

• @bdaca started a discussion: (+3 comments)

  może by dodać defaulta że weźmie najnowszą?

Description

When restoring backup one must specify version of file to restore. We can implement a mechanism to restore the newest available version if no version is specified.