🎉 First version!

.gitignore

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+services.conf

Dockerfile

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+FROM wernight/duplicity
+USER root
+
+VOLUME /services
+
+# Setup files
+COPY . /data
+WORKDIR /data
+
+# Setup cronjob
+COPY crontab /etc/cron.d/backup-cron
+RUN chmod 0644 /etc/cron.d/backup-cron
+RUN crontab /etc/cron.d/backup-cron
+
+CMD ["crond", "-f"]

LICENSE

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+This is free and unencumbered software released into the public domain.
+
+Anyone is free to copy, modify, publish, use, compile, sell, or
+distribute this software, either in source code form or as a compiled
+binary, for any purpose, commercial or non-commercial, and by any
+means.
+
+In jurisdictions that recognize copyright laws, the author or authors
+of this software dedicate any and all copyright interest in the
+software to the public domain. We make this dedication for the benefit
+of the public at large and to the detriment of our heirs and
+successors. We intend this dedication to be an overt act of
+relinquishment in perpetuity of all present and future rights to this
+software under copyright law.
+
+THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND,
+EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF
+MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT.
+IN NO EVENT SHALL THE AUTHORS BE LIABLE FOR ANY CLAIM, DAMAGES OR
+OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE,
+ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR
+OTHER DEALINGS IN THE SOFTWARE.
+
+For more information, please refer to <http://unlicense.org/>

backup.conf.example

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+## Backup config file for service. To find the syntax for this file,
+## take a look at `man duplicity` or the web docs at this url:
+## http://duplicity.nongnu.org/vers8/duplicity.1.html#sect9
+##
+## Special syntax has been added, a single pound sign line will be
+## interpreted like a variable assignment, a line with two pound
+## signs will be seen as comments.
+
+
+## This make daily backups, and keep them for one months, making 
+## incremental backups and doing a full backup once a week. 
+# RETAIN=1M
+# INCREMENT=1W
+# INTERVAL=1D
+
+## The current directory (where this file is in) will get included,
+## but the subdirectory mnt will be excluded. (** matches the working 
+## directory)
++ **
+- **/mnt

backup.sh

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+#!/bin/sh
+
+BASE="/services"
+SERVICES=$(ls $BASE)
+
+echo "#### STARTING NEW BACKUP OF ALL SERVICES ####"
+echo ""
+echo "     SERVICES IN TRACKER:"
+for SERVICE in $SERVICES; do
+	echo "   - ${SERVICE}"
+done
+echo ""
+echo "     BACKUP STARTED ON $(date)"
+echo ""
+echo ""
+echo ""
+
+for SERVICE in $SERVICES; do
+	LOCAL="$BASE/$SERVICE"
+
+	# Skip service if it doesn't have an backup config specified
+	if [ ! -f "$LOCAL/backup.conf" ]; then
+		continue
+	fi
+
+	RETAIN="1M"
+	INCREMENT="1W"
+	INTERVAL="1H"
+
+	# Read config for extra options
+	while IFS='=' read -r key val; do
+		[ "${key##\#\#*}" ] || continue # Skip if line starts with two hash signs
+		[ ! "${key##\#*}" ] || continue # Skip if line doesn't start with a hash sign
+		key="${key##\#}" # Strip the hash sign
+
+		# Key isn't escaped so the space after the hash sign gets consumed 
+		# by the assignment. This way the space is optional
+		export $key="$val" 2>/dev/null ||
+			printf '     warning %s is not a valid variable name\n' "$key"
+	done < "$LOCAL/backup.conf"                                                           
+
+	echo "==== BACKING UP $SERVICE ===="
+	echo ""
+	echo "     Retaining backups for $RETAIN"
+	echo "     Maxiumum incremental backup duration is $INCREMENT"
+	echo "     Running every $INTERVAL"
+	echo ""
+
+	INTERVAL_INT=1
+	case $INTERVAL in
+		*M) INTERVAL_INT=$(( ${INTERVAL%%M} * 24 * 61 / 2 ));;
+		*W) INTERVAL_INT=$(( ${INTERVAL%%W} * 24 * 7 ));;       
+		*D) INTERVAL_INT=$(( ${INTERVAL%%D} * 24 ));;          
+		*H) INTERVAL_INT=$(( ${INTERVAL%%H} ));;           
+		*)  INTERVAL_INT=1;;                      
+	esac
+						   
+	if [ $(( ( $(date +%s) / 3600 ) % $INTERVAL_INT )) -ne 0 ]; then
+		echo "==== SKIPPING $SERVICE"
+		echo "     Service not yet scheduled for backup."
+		echo ""
+		echo ""
+		echo ""
+		echo ""
+		echo ""
+		continue
+	fi
+
+	echo ""
+
+	while read REMOTE; do
+		# Skip if line is empty
+		[ -z "$REMOTE" ] && continue
+
+		REMOTE="$REMOTE/$SERVICE"
+		TYPE=$(echo "$REMOTE" | cut -d \: -f 1)
+		SERVER=$(echo "$REMOTE" | cut -d \: -f 3 | cut -d \@ -f 2 | cut -d \/ -f 1)
+
+		echo "==== USING REMOTE:"
+		echo "     $SERVER over $TYPE"
+		echo ""
+
+		echo "   > BACKUP"
+		duplicity \
+			--verbosity 2 \
+			--no-encryption \
+			--allow-source-mismatch \
+			--full-if-older-than "$INCREMENT" \
+			--include-filelist "$LOCAL/backup.conf" \
+			"$LOCAL" "$REMOTE" \
+			2>&1 | sed 's/^/     /'
+		
+		echo "   > DELETE OLD"
+		duplicity \
+			--verbosity 2 \
+			remove-older-than "$RETAIN" \
+			--no-encryption \
+			--allow-source-mismatch \
+			--include-filelist "$LOCAL/backup.conf" \
+			--force \
+			"$REMOTE" \
+			2>&1 | sed 's/^/     /'
+		
+		echo ""
+		echo "   > VERIFY"
+		duplicity \
+			verify \
+			--verbosity 2 \
+			--no-encryption \
+			--allow-source-mismatch \
+			--include-filelist "$LOCAL/backup.conf" \
+			"$REMOTE" "$LOCAL" \
+			2>&1 | sed 's/^/     /'
+		
+		if [ $? -ne 0 ]; then
+			echo " [!] SOMETHING BAD HAPPENED"
+			echo "     Backups where made but don't check out. Is the remote's storage full?"
+		fi
+
+		echo ""
+		echo ""
+	done < "/data/services.conf"
+	echo ""
+	echo ""
+	echo ""
+
+done
+
+echo "#### BACKUP FINISHED ####"
+echo ""
+echo "     ENDED ON $(date)"
+echo ""
+echo ""
+echo ""
+echo ""
+echo ""
+echo ""
+echo ""
+echo ""
+echo ""

crontab

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+10 * * * * /data/backup.sh 2>/proc/1/fd/2 >/proc/1/fd/1

docker-compose.yml

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+version: '3'
+
+services:
+    backup:
+        build: .
+        volumes:
+          - /services:/services
+          - ./mnt/duplicity/.cache:/home/duplicity/.cache
+          - ./mnt/duplicity/.gnupg:/home/duplicity/.gnupg
+        restart: always

mnt/duplicity/.gitignore

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+.cache/
+.gnupg/

readme.md

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+# Automatic service backup
+
+This docker container will backup services on a schedule, using duplicity as an back end.
+
+
+## How to configure
+
+To configure file hosting locations you can add storage locations to the `services.conf` file. One per line, you can add duplicity connections. The syntax of these can be found in [their docs](http://duplicity.nongnu.org/vers8/duplicity.1.html).
+
+After changing the `services.conf` file, you'll have to rebuild the container.
+
+The script sends logs to the docker log socket (as is usual with containers).
+
+```
+docker-compose build
+docker-compose up -d
+docker-compose logs -f
+```
+
+
+## How to use
+
+This docker container assumes that you use the following directory structure:
+
+```
+some_folder/
+	service1/
+		backup.conf
+	service2/
+		backup.conf
+	service3/
+```
+
+By default, `some_folder` is mapped to `/services` as this is where my services reside. You can change this in the `docker-compose.yml` file.
+
+If you put a `backup.conf` file into a service's directory it will get backed up. If you omit this file, the service will be skipped.
+
+The contents of the backup file are a duplicity include list. You can find more documentation about them at [their docs](http://duplicity.nongnu.org/vers8/duplicity.1.html#sect9)
+
+You can find an example file with some comments at `backup.conf.example`.
+
+### Backup file syntax
+
+Lines starting with `##` are comments.
+
+Lines starting with `#` are interpreted as variable assignments. There are three variables used to control backup behaviour.
+
+```
+## These are also the default values
+# RETAIN=1M
+# INCREMENT=1W
+# INTERVAL=1H
+```
+
+`RETAIN` specifies how long backups should be kept around.  
+`INCREMENT` specifies how long incremental backups are made before creating a full backup again. This will make a full backup every week.  
+`INTERVAL` specifies how long between backups.  
+
+The `RETAIN` and `INCREMENT` variables are directly fed into duplicity and use their syntax. The `INTERVAL` variable is read by the container, and has the following options:
+
+```
+1M for once each month
+1W for once each week
+1D for once each day
+1H for once each hour
+
+2H for once each two hours
+6H for once each six hours
+12H for twice each day
+```
+
+Values must be whole integers, and the minimal value possible is `1H`.

services.conf.example

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+webdavs://nextcloudusername:nextcloudpassword@nextcloudhost/remote.php/webdav/path/to/folder
+b2://b2keyId:b2applicationKeyGenerateOneWithoutSlashesJustKeepTrying@b2BucketName/path/to/folder