Here is our stable tool for such purposes: https://github.com/ceremcem/aktos-dcs-tools

This tool is written to make ssh connections, make backup-root, make mount-root from remote places in mind at first, and then local sessions are added. So it supports local backups, direct remote backups, proxy remote backups. Backups are taken incrementally (only diffs are transferred) and backup directories are standalone (just pick a directory/version to restore, any directory has a full backup). Of course, you have versions (backup.last-0 is the newest one). You can interrupt backup process at anytime and continue later.

Here are the instructions for your specific problem:

 ssh to-your-raspberry
 cd /mnt/usb0/my-rpi-backups
 git clone https://github.com/ceremcem/aktos-dcs-tools backup-tools
 ln -s backup-tools/Makefile .
 
 ./backup-tools/configure # you do not need to make any settings for local sessions, just save the default 
 
 # just for the first time
 make set-local-session  # a flag file is created
 make init               # snapshots directory is created
 
 # anytime you want to back up
 make backup-root        # backup with rsync

Here is our stable tool for such purposes: https://github.com/aktos-io/aktos-dcs-tools

This tool is written to make ssh connections, make backup-root, make mount-root from remote places in mind at first, and then local sessions are added. So it supports local backups, direct remote backups, proxy remote backups. Backups are taken incrementally (only diffs are transferred) and backup directories are standalone (just pick a directory/version to restore, any directory has a full backup). Of course, you have versions (backup.last-0 is the newest one). You can interrupt backup process at anytime and continue later.

Here are the instructions for your specific problem:

 ssh to-your-raspberry
 cd /mnt/usb0/my-rpi-backups
 git clone https://github.com/ceremcem/aktos-dcs-tools backup-tools
 ln -s backup-tools/Makefile .
 
 ./backup-tools/configure # you do not need to make any settings for local sessions, just save the default 
 
 # just for the first time
 make set-local-session  # a flag file is created
 make init               # snapshots directory is created
 
 # anytime you want to back up
 make backup-root        # backup with rsync

EDIT

Now there is a new target added: You can create a physical SD Card from your backups with one command:

make create-disk-from-last-backup

Follow the instructions, create your SD Card, boot RaspberryPi with this newly created SD Card.

Here is our stable tool for such purposes: https://github.com/ceremcem/aktos-dcs-tools

This tool is written to make ssh connections, make backup-root, make mount-root from remote places at first, but then local sessions are added. Backups are taken incrementally (only diffs are backed up) and they are separate (any directory has a full backup). Of course, you have versions (backup.last-0 is the newest one). You can interrupt backup process at anytime and continue later.

Here are the instructions for your specific problem:

 ssh to-your-raspberry
 cd /mnt/usb0/my-rpi-backups
 git clone https://github.com/ceremcem/aktos-dcs-tools backup-tools
 ln -s backup-tools/Makefile .
 
 ./backup-tools/configure # you do not need to make any settings for local sessions, just save the default 
 
 # just for the first time
 make set-local-session  # a flag file is created
 make init               # snapshots directory is created
 
 # anytime you want to back up
 make backup-root        # backup with rsync

Here is our stable tool for such purposes: https://github.com/ceremcem/aktos-dcs-tools

This tool is written to make ssh connections, make backup-root, make mount-root from remote places in mind at first, and then local sessions are added. So it supports local backups, direct remote backups, proxy remote backups. Backups are taken incrementally (only diffs are transferred) and backup directories are standalone (just pick a directory/version to restore, any directory has a full backup). Of course, you have versions (backup.last-0 is the newest one). You can interrupt backup process at anytime and continue later.

Here are the instructions for your specific problem:

 ssh to-your-raspberry
 cd /mnt/usb0/my-rpi-backups
 git clone https://github.com/ceremcem/aktos-dcs-tools backup-tools
 ln -s backup-tools/Makefile .
 
 ./backup-tools/configure # you do not need to make any settings for local sessions, just save the default 
 
 # just for the first time
 make set-local-session  # a flag file is created
 make init               # snapshots directory is created
 
 # anytime you want to back up
 make backup-root        # backup with rsync

Here is our stable tool for such purposes: https://github.com/ceremcem/aktos-dcs-tools

This tool is written to make ssh connections, make backup-root, make mount-root from remote places at first, but then local sessions are added. Backups are taken incrementally (only diffs are backed up) and they are separate (any directory has a full backup). Of course, you have versions (backup.last-0 is the newest one). You can interrupt backup process at anytime and continue later.

Here are the instructions for your specific problem:

 ssh to-your-raspberry
 cd /mnt/usb0/my-rpi-backups
 git clone https://github.com/ceremcem/aktos-dcs-tools backup-tools
 ln -s backup-tools/Makefile .
 
 ./backup-tools/configure # you do not need to make any settings for local sessions, just save the default 
 
 make set-local-session  # a flag file is created
 make init               # snapshots directory is created
 make backup-root        # backup with rsync

Here is our stable tool for such purposes: https://github.com/ceremcem/aktos-dcs-tools

This tool is written to make ssh connections, make backup-root, make mount-root from remote places at first, but then local sessions are added. Backups are taken incrementally (only diffs are backed up) and they are separate (any directory has a full backup). Of course, you have versions (backup.last-0 is the newest one). You can interrupt backup process at anytime and continue later.

Here are the instructions for your specific problem:

 ssh to-your-raspberry
 cd /mnt/usb0/my-rpi-backups
 git clone https://github.com/ceremcem/aktos-dcs-tools backup-tools
 ln -s backup-tools/Makefile .
 
 ./backup-tools/configure # you do not need to make any settings for local sessions, just save the default 
 
 # just for the first time
 make set-local-session  # a flag file is created
 make init               # snapshots directory is created
 
 # anytime you want to back up
 make backup-root        # backup with rsync