backup-borg.sh

# Sign-up at https://www.borgbase.com/ 

# Generate key pair (password? luks?)
$ ssh-keygen -o -a 100 -t ed25519

# Upload public key to borgbase as APPEND-ONLY
$ cat ~/.ssh/id_ed25519.pub

# Check plan capacity vs total backup size, then pay! ;)

# Install software
$ nix-env -i borgbase

# Get the repo URL from https://www.borgbase.com/

# Init repo
borg init -e repokey-blake2 [email protected]:repo 
The authenticity of host 'X.repo.borgbase.com (A.B.C.D)' can't be established.
ECDSA key fingerprint is SHA256:Y.
Are you sure you want to continue connecting (yes/no)? yes
Remote: Warning: Permanently added 'X.repo.borgbase.com,A.B.C.D' (ECDSA) to the list of known hosts.
Enter passphrase for key '$HOME/.ssh/id_W': 
Enter new passphrase: 
Enter same passphrase again: 

...

IMPORTANT: you will need both KEY AND PASSPHRASE to access this repo!
Use "borg key export" to export the key, optionally in printable format.
Write down the passphrase. Store both at safe place(s).

# Export key to be printed
$ borg key export [email protected]:repo $HOME/.secrets/borgbase-key.txt
Enter passphrase for key '$HOME/.ssh/id_W': 
$ cat borgbase-key.txt   
BORG_KEY ................

# Create first backup
$ borg create --verbose --progress --stats \
              --compression auto,lzma,9 \
              [email protected]:repo::{hostname}-{user}-{now} \
              $HOME \
              --exclude "$HOME/.cache"
Enter passphrase for key '$HOME/.ssh/id_W': 
Enter passphrase for key ssh://[email protected]/./repo: 
2.92 GB O 2.07 GB C 496.97 MB D 59365 N $HOME/old...lbox/box-disk001.vmdk

# using compression 4 days, 7 attempts to backup 65GiB, try another system

# TODO
# a. --chunk-size
# https://zyradyl.moe/2016/10/02/Collegi-Backup-System/
# https://github.com/borgbackup/borg/blob/master/docs/misc/create_chunker-params.txt
# https://borgbackup.readthedocs.io/en/stable/usage/notes.html#chunker-params
# b. rsync.net as a cloudprovider
# https://jstaf.github.io/2018/03/12/backups-with-borg-rsync.html
# c. check backups commands
# d. restore commands