Note: if you have to do a factory reset, your first sample bank (Machinedrum), first set of Userwaves (Monomachine), and first snapshot will be deleted. Therefore, you probably should avoid storing anything valuable there.
From the MD manual “When doing a factory reset the Battery Backed Memory will be replaced by factory patterns, kits, songs and global settings. The first Sample bank will be replaced with factory samples, given you have a UW version of the Machinedrum. The first Snapshot will be replaced with factory patterns, kits, songs and global settings. No other Snapshots or Sample banks on the +Drive will be affected.”