Another pkg feature request or some .sh method

[Jeffrey Bouquet]

Since this machine is rarely up during the periodic (overnight) backup
of local.sqlite, manually copying the file has once or twice due to shell
history inadvertently  overwritten the recent version with one a few
days old. 

Could pkg store a 2nd copy somewhere automatically somehow, or does
someone know the most convenient foolproof .login or something to ensure
that an accidental erasure means not an hour or two of restores VS just
copying a 2nd copy from somewhere.    [ I'd like to emphasize
convenient, and foolproof, something to eventually put into base or into
most/some of the pkg commands... ]

As an aside, if I'm not mistaken, it could be backported if possible to
dragonflyBSD (etc)...