Sourcegraph.com - add redis-store & precise-code-intel-bundle-manager snapshotting

Created by: slimsag

• precise-code-intel-bundle-manager contains LSIF upload data we ideally do not want to lose. It's not critical if lost, but we should avoid losing it if we can. Backups of this are ideal.
• redis-store now contains user analytics/metrics data (from what I understand) so it is in a similar boat: not critical to keep, but ideal to keep.

We should add snapshotting for both on Sourcegraph.com.