timestamped snapshots in local repo

[Ch...@emc.com]

Are there supposed to be timestamp uniquely named snapshot artifacts in my local repo?  I'm investigating the uniqueVersion = false setting to solve a disks space problem, but I read some threads here and there that expressed disagreement on whether there should actually be an accumulation of the these uniquely named artifacts in a local repo under normal operating conditions.  I assume they show up there whenever a build has a snapshot dependency.  I know that "installing" a snapshot doesn't create a uniquely named one, in contrast.