Our Zimbra server keeps the last 30 days of backups. Last week, we noticed that the Sept 26 Full Backup was 42G, the other full backups hover around 3-4G. After that file dropped off, the Oct 03 Full Backup increased in size to 43G.

Is it usual for the backups to change in size?

Release 5.0.11_GA_2695.SuSEES10_20081117024501 openSUSE_10.2 NETWORK edition