Add garage backup info

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+Add the admin account as `deuxfleurs` to your `~/.mc/config` file
+
+You need to choose some names/identifiers:
+
+```bash
+export ENDPOINT="https://s3.garage.tld"
+export SERVICE_NAME="example"
+
+
+export BUCKET_NAME="backups-${SERVICE_NAME}"
+export NEW_ACCESS_KEY_ID="key-${SERVICE_NAME}"
+export NEW_SECRET_ACCESS_KEY=$(openssl rand -base64 32)
+export POLICY_NAME="policy-$BUCKET_NAME"
+```
+
+Create a new bucket:
+
+```bash
+mc mb deuxfleurs/$BUCKET_NAME
+```
+
+Create a new user:
+
+```bash
+mc admin user add deuxfleurs $NEW_ACCESS_KEY_ID $NEW_SECRET_ACCESS_KEY
+```
+
+Add this new user to your `~/.mc/config.json`, run this command before to generate the snippet to copy/paste:
+
+```
+cat > /dev/stdout <<EOF
+"$NEW_ACCESS_KEY_ID": {
+	"url": "$ENDPOINT",
+	"accessKey": "$NEW_ACCESS_KEY_ID",
+	"secretKey": "$NEW_SECRET_ACCESS_KEY",
+	"api": "S3v4",
+	"path": "auto"
+},
+EOF
+```
+
+---
+
+Create a policy for this bucket and save it as json:
+
+```bash
+cat > /tmp/policy.json <<EOF
+{
+    "Version": "2012-10-17",
+    "Statement": [
+        {
+            "Effect": "Allow",
+            "Action": [
+                "s3:ListBucket"
+            ],
+            "Resource": [
+                "arn:aws:s3:::${BUCKET_NAME}"
+            ]
+        },
+        {
+            "Effect": "Allow",
+            "Action": [
+                "s3:*"
+            ],
+            "Resource": [
+                "arn:aws:s3:::${BUCKET_NAME}/*"
+            ]
+        }
+    ]
+}
+EOF
+```
+
+Register it:
+
+```bash
+mc admin policy add deuxfleurs $POLICY_NAME /tmp/policy.json
+```
+
+Set it to your user:
+
+```bash
+mc admin policy set deuxfleurs $POLICY_NAME user=${NEW_ACCESS_KEY_ID}
+```
+
+Now it should display *only* your new bucket when running:
+
+```bash
+mc ls $NEW_ACCESS_KEY_ID
+```
+
+---
+
+Now we need to initialize the repository with restic.
+
+```bash
+export AWS_ACCESS_KEY_ID=$NEW_ACCESS_KEY_ID
+export AWS_SECRET_ACCESS_KEY=$NEW_SECRET_ACCESS_KEY
+export RESTIC_REPOSITORY="s3:$ENDPOINT/$BUCKET_NAME"
+export RESTIC_PASSWORD=$(openssl rand -base64 32)
+```
+
+Then init the repo for restic from your machine:
+
+```
+restic init
+```
+
+*I am using restic version `restic 0.12.1 compiled with go1.16.9 on linux/amd64`*
+
+See your snapshots with:
+
+```
+restic snapshots
+```
+
+Check also these useful commands:
+
+```
+restic ls
+restic diff
+restic help
+```
+
+---
+
+Add the secrets to Consul, near your service secrets.
+The idea is that the backuping service is a component of the global running service.
+You must run in `app/<name>/secrets/<subpath>`:
+
+```bash
+echo "USER Backup AWS access key ID" > backup_aws_access_key_id
+echo "USER Backup AWS secret access key" > backup_aws_secret_access_key
+echo "USER Restic repository, eg. s3:https://s3.garage.tld" > backup_restic_repository
+echo "USER Restic password to encrypt backups" > backup_restic_password
+```
+
+Then run secretmgr:
+
+```bash
+# Spawning a nix shell is an easy way to get all the dependencies you need
+nix-shell
+
+# Check that secretmgr works for you
+python3 secretmgr.py check <name>
+
+# Now interactively feed the secrets
+python3 secretmgr.py gen <name>
+```
+
+---
+
+Now we need a service that runs:
+
+```
+restic backup .
+```
+
+And also that garbage collect snapshots.
+I propose:
+
+```
+restic forget --prune --keep-within 1m1d --keep-within-weekly 3m --keep-within-monthly 1y
+```