Backup and recovery strategies in Raspberry Pi - Interactive Code Practice

Practice - 5 Tasks

1fill in blank

easy

Complete the code to create a backup of the Raspberry Pi SD card using the dd command.

Raspberry Pi

sudo dd if=/dev/mmcblk0 of=[1] bs=4M status=progress

Drag options to blanks, or click blank then click option'

A/backup/pi_backup.img

B/home/pi/backup.img

C/dev/sda1

D/tmp/backup.img

Attempts:

3 left

💡 Hint

Common Mistakes

Using a device path instead of a file path for the output.

Not specifying the output file path.

The dd command copies the entire SD card to the specified image file. Using /backup/pi_backup.img saves the backup in the backup folder.

2fill in blank

medium

Complete the command to restore the Raspberry Pi SD card from a backup image.

Raspberry Pi

sudo dd if=[1] of=/dev/mmcblk0 bs=4M status=progress

Drag options to blanks, or click blank then click option'

A/tmp/restore.img

B/dev/mmcblk0

C/home/pi/backup.img

D/backup/pi_backup.img

Attempts:

3 left

💡 Hint

Common Mistakes

Using the device path as input file instead of the backup image.

Mixing up input and output file paths.

The input file (if=) should be the backup image file to restore from. /backup/pi_backup.img is the correct backup image path.

3fill in blank

hard

Fix the error in the command to compress the backup image using gzip.

Raspberry Pi

gzip [1]

Drag options to blanks, or click blank then click option'

A/backup/pi_backup.img

B/home/pi

C/tmp

D/dev/mmcblk0

Attempts:

3 left

💡 Hint

Common Mistakes

Trying to gzip a device path or directory.

Not specifying the file to compress.

The gzip command compresses files. You must specify the backup image file, not a device or directory.

4fill in blank

hard

Fill both blanks to create a script that checks if the backup file exists and then copies it to a USB drive.

Raspberry Pi

if [ -[1] /backup/pi_backup.img ]; then
  cp /backup/pi_backup.img [2]/pi_backup.img
fi

Drag options to blanks, or click blank then click option'

Ae

B/media/usb

Cf

D/mnt/usb

Attempts:

3 left

💡 Hint

Common Mistakes

Using wrong test flag like -f which checks if it is a regular file but might fail if symbolic links exist.

Using incorrect USB mount path.

The -e flag checks if the file exists. The USB drive is mounted at /media/usb to copy the backup.

5fill in blank

hard

Fill all three blanks to create a Python dictionary comprehension that maps filenames to their sizes only if size is greater than 1000 bytes.

Raspberry Pi

sizes = { [1]: [2] for [3] in files if os.path.getsize([3]) > 1000 }

Drag options to blanks, or click blank then click option'

Afilename

Bos.path.getsize(filename)

Dfile

Attempts:

3 left

💡 Hint

Common Mistakes

Using different variable names in key, value, and loop variable.

Not calling os.path.getsize correctly.

This comprehension creates a dictionary where keys are filenames and values are their sizes, filtering only files larger than 1000 bytes.