Why each backup requires so much space?

[zickzhou]

Originally Posted by dnanian

I don't understand this question. Could you rephrase?

For some PC backup softwares, for example "PC b***up Pro", I can schedule hourly backup, and I can go back to each different backups to retrieve the version of a file I would like to restore.

For example, I have the hourly backup setup, and I've been editing a word file since 8 this morning. If i want to restore that word file, I can restore the 8 am version, 9 am version, 10 am version and 11 am version.

In superduper, I found out that I can also setup the hourly backup using combination of daily update schedules. But I am wondering since all the backup schedules are running on a same sparse image, does that mean there can be only one retrievable version of a file (the very last backup)?