Prev Chapter 10.
Backups take a lot of space, which can cost quite a lot of money.
To reduce the space needed, the backups can be compressed. There are several ways of doing this. Unfortunately, compressed backups can cause trouble. Due to the nature of how compression works, if a single bit is wrong, all the rest of the compressed data will be unusable. Some backup programs have some built in error correction, but no method can handle a large number of errors.