borgbackup 2.x migration notes
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borg 2.x is incompatible with borg 1.x. This affects both the interface and the
repository format. For instance `borg init` has become `borg rcreate`. The only
thing borg 2.x can do with a borg 1.x repository or borg 1.x serve is read.
Thus, repositories must be upgraded to the borg 2.x repository format using
`borg transfer` which copies the contents. For Debian, borg 1.x and borg 2.x
are packaged in a coinstallable way such that borg 2.x is available as the
`borg2` command.