[Research] How to limit concurrency of backup processes?

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To prevent DDOSing of a backup instance, we want to limit concurrency of backup processes.

@ibaum

Perhaps a limit would be good. We currently use a file lock in the existing backup to enforce this, to enforce only one backup ata a time. Perhaps we do a per data type lock?

The file lock works well for smaller installations, but will be trickier for larger installations. Maybe we can use the consul kv for this.

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