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>Then what do you mean by working in the background? Perform a zip/unzip operation with no UI? If so, that is certainly possiblle with DynaZip. However, VFP will be in a wait state until that zip/unzip is completed.

Xceed backup library realy works in backgroud (maybe it launched another process - I do not know, I've already uninstalled it). After setting some properties result was cool. An user worked (local view editing ) and backup of local tables was smooth running. (During backup time I've simply disabled saving of changes)
I choose DynaZip Active because:
a) with DynaZip I have another fuctionality that Xceed backup library lack.
b) it looks very solid
c) it is cheaper than other similar products

>YOu might want to look at my DynaZip class in the UT downloads.
Thanks Mark, I use DynaZip ActiveX so I do not need wrapper class (at least I think so)