What’s a backup?

I use Borg Backup, automated with a bash script that Borg provides. A cron job runs the script at the desired frequency. I keep backups on different computers, ideally I would recommend one copy in the cloud and one copy on a local machine. Borg compresses and encrypts its backups.

Edit: I migrated a server once using the backups from this system and it worked great.

Borg backup is gold standard, with Vorta as a very nice GUI on machines that need it. Otherwise, all my other Linux machines are running in proxmox hypervisors and have container/snapshot/vm backups regularly through proxmox backup server to another machine. All the backup data is then replicated regularly, remotely via truenas scale replication tasks.

Hope.

All my code and projects are on GitHub/codeberg.

All my personal info and photos are on proton drive.

If Linux shits itself (and it does often) who cares. I can have it up and running again in a fresh install in ten minutes.

I use rsync to incrementally back up / to a separate drive, as well as a drive on another device (my server), which then packs, compresses and encrypts the latest backup of all devices daily, and uploads them to Hetzner as well as GDrive.

I plug in an external drive every so often and drag and drop parts of my home dir into it like it’s 1997. I’m not running a data center here. The boomer method is good enough and I don’t do anything important enough to warrant going all out with professional snapshot based backup solutions and stuff. And I only save personal documents, media, and custom config files. Everything else is replaceable.

Dump configs to backup drive. Pray to the machine spirit that things don’t blow up. Only update when I remember. I’m a terrible admin for my own stuff.

I was talking with a techhead from the 80s about what he did when his tape drives failed and the folly that is keeping data alive on a system that doesn’t need to be. His foolproof backup storage is as follows.

1. At Christmas buy a new hard drive. If Moore’s law allows, it should be double what you currently have
2. Put your current backup hardrive into a SATA drive slot. Copy over backup into new hard drive.
3. Write with a sharpie the date at which this was done on the harddrive. The new hard drive is your current backup.
4. Place the now old backup into your drawer and forget about it.
5. On New Years Day, load each of the drives into a SATA drive slot and fix any filesystem issues.
6. Put them back into the drawer. Go to step 1.

etckeeper, and borg/vorta for /home

I try to be good about everything being installed in packages, even if Im the one that made the package. that means I only have to worry about backing up my local package archive. but Ive never actualy recreated a personal system from a backup, and usually end up starting from a fresh install, slowly adding back things from the backup if I missed them. this tends to cut down on cruft and no longer needed hacks and fixes. also makes for a good way to be exposed to new paradigms (desktop environments, shells, etc)

something that helps is daily notes. one file for any day Im working on my system and want to remember what a custom file, confg edit, or downloaded/created package does and why. these get saved separately and I try to remember to grep them before asking the internet

i see the benefit to snapshots, but disk space is expensive, and Im (usually) careful (enough) not to lock myself out or prevent boots. anything catastophic I have to fix is usually seen as a fun, stressful learning experience! that rarely happens anymore, for better or for worse

Not to save stuff

Scuse the cut and paste, but this is something I recently thought quite hard about and blogged, so stealing my own content:

What to back up? This is a core question to ask when you start planning. I think it’s quite simply answered by asking the secondary question: “Can I get the data again?” Don’t back up stuff you downloaded from the public internet unless it’s particularly rare. No TV, no Movies, no software installers. Don’t hoard data you can replace. Do back up stuff you’ve personally created and that doesn’t exist elsewhere, or stuff that would cause you a lot of effort or upset if it wasn’t available. Letters you’ve written, pictures you’ve taken, code you authored, configurations and systems that took you a lot of time to set up and fine tune.

If you want to be able to restore a full system, that’s something else and generally dealt best with imaging – I’m talking about individual file backups here!

Backup Scenario Multiple household computers. Home linux servers. Many services running natively and in docker. A couple of windows computers.

Daily backups Once a day, automate backups of your important files.

On my linux machines, that’s things like some directories like /etc, /root, /docker-data, some shared files.

On my windows machines, then that’s some mapping data, word documents, pictures, geocaching files, generated backups and so on.

You work out the files and get an idea of how much space you need to set aside.

Then, with automated methods, have these files copied or zipped up to a common directory on an always-available server. Let’s call that /backup.

These should be versioned, so that older ones get expired automatically. You can do that with bash scripts, or automated backup software (I use backup-manager for local machines, and backuppc or robocopy for windows ones)

How many copies you keep depends on your preferences – 3 is a sound number, but choose what you want and what disk space you have. More than 1 is a good idea since you may not notice the next day if something is missing or broken.

Monthly Backups – Make them Offline if possible

I puzzled a long time over the best way to do offline backups. For years I would manually copy the contents of /backup to large HDDs once a month. That took an hour or two for a few terabytes.

Now, I attach an external USB hard drive to my server, with a smart power socket controlled by Home Assistant.

This means it’s “cold storage”. The computer can’t access it unless the switch is turned on – something no ransomware knows about. But I can write a script that turns on the power, waits a minute for it to spin up, then mounts the drive and copies the data. When it’s finished, it’ll then unmount the drive and turn off the switch, and lastly, email me to say “Oi, change the drives, human”.

Once I get that email, I open my safe (fireproof and in a different physical building) and take out the oldest of three usb Caddies. Swap that with the one on the server and put that away. Classic Grandfather/Father/Son backups.

Once a year, I change the oldest of those caddies to “Annual backup, 2024” and buy a new one. That way no monthly drive will be older than three years, and I have a (probably still viable) backup by year.

BTW – I use USB3 HDD caddies (and do test for speed – they vary hugely) because I keep a fair bit of data. But you can also use one of the large capacity USB Thumbdrives or MicroSD cards for this. It doesn’t really matter how slowly it writes, since you’ll be asleep when it’s backing up. But you do really want it to be reasonably fast to read data from, and also large enough for your data – the above system gets considerably less simple if you need multiple disks.

Error Check: Of course with automated systems, you need additional automated systems to ensure they’re working! When you complete a backup, touch a file to give you a timestamp of when it was done – online and offline. I find using “tree” to catalogue the files is worthwhile too, so you know what’s on there.

Lastly – test your backups. Once or twice a year, pick a backup at random and ensure you can copy and unpack the files. Ensure they are what you expect and free from errors.

Synology NAS. I really love that thing. I use their synology drive software to backup the Linux home folder, as well as windows PCs, iPads, iPhones etc. I use their photos mobile software to automatically backup phone photos and videos. I also synchronize a few select folders between PCs so certain in-use files are always up to date. I set the NAS to keep 30 old versions of every file. This works great for my college kids - dad has a copy of everything in case they nuke a paper or something (which has happened).

I stopped cloning drives long ago. Now I just reinstall the os and packages. With Linux, this is honestly faster than deploying a backup - a single pacman command installs everything I want. Then I just log into things as I open them. Ya I might have to futz around with some settings or redownload some big games on steam - but the eye candy and games can wait - I can be productive pretty quickly after an install.

I DO use btrfs with automatic snapshots (snapper and btrfs assistant). This saves me from myself when I bork an update (which I’ve done more than once). If I make a mistake, I just rollback a snapshot, and try again without my stupid mistakes. This has saved my install 3 or 4 times now.

Lastly, I sneaker net an external hard drive to my office. On it is a manual backup of the NAS. I do this once per month. This protects from catastrophic failures like my house burning down. I might lose a month or so of pictures in the worst case scenario, but I still have my 25+ years of pictures of my kids, wedding videos, etc.

In the end, the only thing that really matters is not losing my lifetime of family pictures and the good memories they provoke.

Here’s one that probably nobody else here is doing. The backup goes on my mobile device. Yes, the thing in my pocket.

• Mount it over SSHFS on the local network
• Unlock a LUKS container in the form of a 30GB sparse file on the device
• rsync the files across
• Lock, unmount

The backup is incremental but the container file never changes size, no matter what’s in it. Your data is in two places and always under your physical control. But the key is never stored on the remote device, so you could also do this with a VPS.

Highly recommended.

Example of a Bash script that performs the following tasks

1. Checks the availability of an important web server.
2. Checks disk space usage.
3. Makes a backup of the specified directories.
4. Sends a report to the administrator’s email.

Example script:

#!/bin/bash

# Settings
WEB_SERVER="https://example.com"
BACKUP_DIR="/backup"
TARGET_DIRS="/var/www /etc"
DISK_USAGE_THRESHOLD=90
ADMIN_EMAIL="admin@example.com"
DATE=$(date +"%Y-%m-%d")
BACKUP_FILE="$BACKUP_DIR/backup-$DATE.tar.gz"

# Checking web server availability
echo "Checking web server availability..."
if curl -s --head $WEB_SERVER | grep "200 OK" > /dev/null; then
echo "Web server is available."
else
echo "Warning: Web server is unavailable!" | mail -s "Problem with web server" $ADMIN_EMAIL
fi

# Checking disk space
echo "Checking disk space..."
DISK_USAGE=$(df / | grep / | awk '{ print $5 }' | sed 's/%//g')
if [ $DISK_USAGE -gt $DISK_USAGE_THRESHOLD ]; then
echo "Warning: Disk space usage exceeded $DISK_USAGE_THRESHOLD%!" | mail -s "Problem with disk space" $ADMIN_EMAIL
else
echo "There is enough disk space."
fi

# Creating backup
echo "Creating backup..."
tar -czf $BACKUP_FILE $TARGET_DIRS

if [ $? -eq 0 ]; then
echo "Backup created successfully: $BACKUP_FILE"
else
echo "Error creating backup!" | mail -s "Error creating backup" $ADMIN_EMAIL
fi

# Sending report
echo "Sending report to $ADMIN_EMAIL..."
REPORT="Report for $DATE\n\n"
REPORT+="Web server status: $(curl -s --head $WEB_SERVER | head -n 1)\n"
REPORT+="Disk space usage: $DISK_USAGE%\n"
REPORT+="Backup location: $BACKUP_FILE\n"

echo -e $REPORT | mail -s "Daily system report" $ADMIN_EMAIL

echo "Done."

Description:

1. Check web server: Uses curl command to check if the site is available.
2. Check disk space: Use df and awk to check disk usage. If the threshold (90%) is exceeded, a notification is sent.
3. Create a backup: The tar command archives and compresses the directories specified in the TARGET_DIRS variable.
4. Send a report: A report on all operations is sent to the administrator’s email using mail.

How to use:

1. Set the desired parameters, such as the web server address, directories for backup, disk usage threshold and email.
2. Make the script executable:

chmod +x /path/to/your/script.sh

3. Add the script to cron to run on a regular basis:

crontab -e

Example to run every day at 00:00:

0 0 * * * /path/to/your/script.sh