The Docker Volume Manager (dvm) helps with backing up and restoring Docker volumes.

dvm.py

#!/usr/bin/env python3

import os, sys

def main(operation, volumeName):
    match operation:
        case 'backup':
            backup(volumeName)
        case 'restore':
            restore(volumeName)
        case 'inspect':
            inspect(volumeName)
        case _:
            print('Invalid action. Use either backup, restore or inspect.')
            exit(1)


def backup(volumeName):
    archiveName = getArchiveName(volumeName)

    print('Backing up', volumeName, 'to', archiveName)

    os.system('docker run --rm -v %s:/volume -v $(pwd):/backup alpine tar czf /backup/%s -C /volume .' % (volumeName, archiveName))

    print('Done. ', archiveName, 'created.')


def restore(archiveName):
    volumeName = getVolumeName(archiveName)

    print('Restoring', volumeName, 'from', archiveName)

    os.system('docker run --rm -v %s:/volume -v $(pwd):/backup alpine tar xzf /backup/%s -C /volume' % (volumeName, archiveName))

    print('Done.', volumeName, 'created.')


def inspect(volumeName):
    print('Inspecting', volumeName)
    os.system('docker run -it --rm -w /volume -v %s:/volume alpine /bin/sh' % volumeName)


def getArchiveName(volumeName):
    return '%s.tar.gz' % volumeName


def getVolumeName(archiveName):
    return archiveName.removesuffix('.tar.gz')


if (len(sys.argv) != 3):
    print('Usage:')
    print('./dvm.py backup <volume name>')
    print('./dvm.py restore <archive name>')
    print('./dvm.py inspect <volume name>')
    exit(1)

if (__name__ == '__main__'):
   main(sys.argv[1], sys.argv[2])