Is this a distributed (Gateways separed from management) or stand alone (Gateway + management in the same box) environment.
If these are only gateways then copy/paste the show configuration output, snapshot is not necessary in most cases unless you have some configurations such as two factor authentication with RSA SecureID or some custom configuration in your gateway, you can always backup these specific files alone anyway.
I remember having some issues with snapshots from SPLAT in Gaia R77.30, you can always install again that version and restore the snapshot or backup from there.
Regards,
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