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Make a work copy for your computer, plus two backup copies stored in two different locations, preferribly at least several miles apart on two different types / brands of media (ie. if using DVDs for backup, use one from brand A and another from brand B).
Always leave at least one backup off-site at all times - never overwrite all backups at the same time when updating backups.
Though sometimes you want the data to be gone ... be aware that whenever you decrypt the file, traces of it will be likely be left behind, such as in temp / swap files, unallocated areas on HD, mapped out areas on the HD, etc.
If the encryption is intended to simply keep curious casual users (staff, family, friends, etc) from accessing the data, then the traces left behind issue is likely only a minimal concern, if any.
Ron
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Domagon - Website Management and Domain Name Sales
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