I've only had a few problems with corruption of compressed files, these have been due to media failure. e.g. floppy disks over 8 years old, Iomega zip disks over 6 and home-burned CDs over 14 months old.

Those last ones rather pissed me off. I bought some new CD-Rs and burned some backups and then shipped them. The shipping company not only tried to double bill me, but also lost the entire shipment for 14 months (it should have taken a few days). When the shipment arrived, I check the files and found that more than a handful had gone bad. Since I had checked just after making them, I know that they had been good at one time.

Back when I used to use MS Windows and MS Office, one or the other used to corrupt the files occasionally so that I had to revert to the back up. Just how often is hard to recall, but I do know that it happened enough that I made extra backups of important documents in progress and for all documents used the 'always save backup' option.

-Lars
Lars Nooden ([EMAIL PROTECTED])
        Software patents endanger the legal certainty of software.
        Keep them out of the EU by writing your MEP, keep the market open.

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