The plakar tarball command creates a tarball from a snapshot.
plakar tarball <snapshotID>
plakar tarball <snapshotID>:/path/to/directory
$ plakar ls
2023-08-13T08:26:12Z 227b0536 13 MB 0s /bin
2023-08-13T08:26:13Z a946463d 13 MB 0s /bin
$ ls -l
[...]
-rw-r--r-- 1 gilles staff 4399374 Aug 13 11:03 plakar-2023-08-13T09:03:26Z.tar.gz
[...]
$ plakar-2023-08-13T09:03:26Z.tar.gz
plakar-2023-08-13T09:03:26Z.tar.gz: gzip compressed data, original size modulo 2^32 12938752