restic/changelog/unreleased/issue-3941

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Enhancement: Support `--group-by` for backup parent selection
The `backup` command by default selected the parent snapshot based on the hostname
and the backup targets. When the backup path list changed, the `backup` command
was unable to determine a suitable parent snapshot and had to read all
files again.
The new `--group-by` option for the `backup` command allows filtering snapshots
for the parent selection by `host`, `paths` and `tags`. It defaults to
`host,paths` which selects the latest snapshot with hostname and paths matching
those of the backup run. This matches the behavior of prior restic versions.
The `--group-by` option should be set to the same value as passed to
`forget --group-by`.
https://github.com/restic/restic/issues/3941
https://github.com/restic/restic/pull/4081