A boilerplate shell code to implement restic backups with S3-compatible backend.

restic-s3-boilerplate.sh

#!/bin/bash

export RESTIC_REPOSITORY="s3:https://url.to/s3/compatible/bucket"
export RESTIC_PASSWORD="RESTIC_PASSWORD"
export AWS_ACCESS_KEY_ID="AWS_ACCESS_KEY_ID"
export AWS_SECRET_ACCESS_KEY="AWS_SECRET_ACCESS_KEY"

# Automatically initialize restic repo if it does not exist
status="$(restic cat config 2>&1)"
if [ $? -ne 0 ]; then
  if echo $status | grep -qF "Fatal: unable to open config file: Stat: The specified key does not exist."; then
    restic init
  else
    restic cat config
    exit 1
  fi
fi

# Perform the backup
restic backup \
  --exclude /paths/to/backup/ignore \
  /paths/to/backup

# Clenup the old snapshots
restic forget --keep-daily=7 --keep-weekly=4 --keep-monthly=3 --prune

# Verify the data integrity
restic check --read-data