Jim, btrfs send reliability has been an issue, though I've been able to successfully use it for my backups. buttersink usually detects the errors and will either move the destination snapshot to mark it as partial/failed (for btrfs), or cancel and delete the partial upload (for S3). I've also found that it helps to wait a while (e.g. 30 seconds) after any volume deletes before trying the send/sync. I hope btrfs-progs will get more reliable, too.
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