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Where to start with backups? (lemmy.world)
submitted 9 months ago by to c/selfhosted@lemmy.world
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hi peeps.

Im early on my selfhosting journey and managed to setup some things as a test in docker. the main service im looking to run is ERPNext. after a while I got it up and running so now I want to back this up including all the customization I did in the app.

where to start with this? any intuitive guide?

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[–] 3 points 9 months ago (4 children)

In addition to daily backups, once a month I image the drive. I wrote a simple script triggered by a cron job to image the drive to a NAS backup. The daily backups go to 3 different offsite storage facilities, and two go to separate NAS drives. All drive images are kept both local and off premise as well. So, for individual files, etc, I can restore them from the daily backups. If the wheels fall off, I can restore the whole drive from an image. Might be a bit over engineered but I've been caught a few times and so I just decided that won't happen again.

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  • [–] 2 points 9 months ago (3 children)

    Interesting.

    Yep, I agree there's 2 types of backups:

    • data
    • OS image

    Out of curiosity, how are you doing the drive imaging?

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  • [–] 1 point 9 months ago* (last edited 9 months ago) (2 children)

    Out of curiosity, how are you doing the drive imaging?

    I wrote a script that is fired by a cron job once a month:

    sudo nano /usr/local/bin/backup_drive.sh

    spoiler

    # Directory to store backups

BACKUP_DIR="/mnt/myhdd"

# Drive to backup

DRIVE="/dev/sdX"

# Create a timestamp

TIMESTAMP=$(date +"%Y%m%d")

# Filename for the new image

NEW_IMAGE="$BACKUP_DIR/my_drive_image_$TIMESTAMP.img"

# Create the image

sudo dd if=$DRIVE of=$NEW_IMAGE bs=4M status=progress

# Keep the last 3 images

ls -tp $BACKUP_DIR/my_drive_image_*.img | grep -v '/$' | tail -n +4 | xargs -I {} rm -- {}

    Make the script executable:

    sudo chmod +x /usr/local/bin/backup_drive.sh

    Create Cron:

    sudo crontab -e

    0 3 1 * * /usr/local/bin/backup_drive.sh

    Verify cron:

    sudo crontab -l

    I'm sure it could be written differently or that there is a better way to do the imaging, but that is the extent of my notes, and it works for me. As with any code you find on the internet, it is wise to evaluate before dropping on a production server.

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