offen/docker-volume-backup
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docker-volume-backup/docs/how-tos/use-with-docker-swarm.md
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Docs site (#269) 
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Use with Docker Swarm default How Tos 13

Use with Docker Swarm

By default, Docker Swarm will restart stopped containers automatically, even when manually stopped. If you plan to have your containers / services stopped during backup, this means you need to apply the on-failure restart policy to your service's definitions. A restart policy of always is not compatible with this tool.

When running in Swarm mode, it's also advised to set a hard memory limit on your service (~25MB should be enough in most cases, but if you backup large files above half a gigabyte or similar, you might have to raise this in case the backup exits with Killed):

services:
  backup:
    image: offen/docker-volume-backup:v2
    deployment:
      resources:
        limits:
          memory: 25M