Backup as in backing up one perkeep instance to another is the "pk sync" command (https://github.com/perkeep/perkeep/blob/master/cmd/pk/sync.go https://github.c

Backup as in backing up one perkeep instance to another is the "pk sync" command (https://github.com/perkeep/perkeep/blob/master/cmd/pk/sync.go https://github.com/perkeep/perkeep/blob/master/cmd/pk/sync.g...). You give it the addresses of source and destination blobservers, it enumerates blobs in both, and copies the source blobs missing from destination into the destination server.