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Add "Usage" section to README

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@ -12,19 +12,26 @@ The problem is full disk images can get quite big, even if there is not much spa
used on the disk. Therefore compressing images does make sense. However by simply used on the disk. Therefore compressing images does make sense. However by simply
gzipping images one is not be able to simply mount the image in case access to a gzipping images one is not be able to simply mount the image in case access to a
single file is needed. single file is needed.
By using squashfs this is circumventet. By using squashfs this is circumventet.
The squashfs can be mounted in a compressed state being completly transparend The squashfs can be mounted in a compressed state being completly transparend
to the user (besides being read-only). to the user (besides being read-only).
When the squasfs is mounted the # Usage
```bash When the squasfs is mounted the image file can be mounted as if it existed
# ./backup.sh
Backup source: /dev/sda1
Backup destination: /mnt/backupOfsda1
```
image file can be mounted as if it existed
uncompressed. By again mounting the image file (using e.g. loopback devices) uncompressed. By again mounting the image file (using e.g. loopback devices)
it is possible to access browse/access single files inside the compressed it is possible to access browse/access single files inside the compressed
full disk backup. full disk backup.
This script was created because I could not remember the commands used to create This script was created because I could not remember the commands used to create
such a compressed image and got tired of searching every time. such a compressed image and got tired of searching every time.
# Usage
The script is used interactively.
The user will be prompted for everything that is needed to create the backup.
```bash
# ./backup.sh
Backup source: /dev/sda1
Backup destination: /mnt/backupOfsda1
```