The normal iPad backup backs up the shows and user presets (via iTunes or iCloud). The present show is also stored in the mixer itself. Personally I only use a single show to store all the snapshots for the various bands I work with. Working with multiple show files gets confusing especially as to how to sync them across multiple iPads.
ShortScale#271 Mediocre#783 Country#46
MB200 MicroVR Bugera1960+BVV3000
2x SVT210AV 212MBE
MW SquireMustang, HofnerGalaxyCT, IbanezMikro
CortActionBassJr., StaggFusion3/4, BriceHXB-405 3/4