How to update with a custom build without losing all the data?

I have a ZTE Open I regularly update with custom builds. Every time I do this, I lose all of my data on the phone, such as contacts, installed apps from the Market store, settings (including wireless and email settings).
Recovering all of this data and settings every time is extremely annoying. Is there a way not to lose them in the process, or to save them and repristining them afterwards?

Thanks, Ralph!
I tried the backup_restore_profile.sh tool and apparently it worked great: I backed up my data, flashed my old build on the device (which erased all of my data) and then restored everithing, including installed apps and settings.
I will try this with a new FFOS version (like 2.1) before declaring the problem completely solved.
EDIT: I'm not going to try flashing FFOS 2.1 on the ZTE Open anymore, since I'm now a proud owner of a Flame. The backup_restore_profile.sh tool seemed to work pretty well though, so I will mark the question as solved without further tests.

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