Temporary pause backup script

Please add option to temporary pause creating new backup archives if local temporary destination contain less than 10% free space left.

SSD drives are too fast and new backup archives are created faster than existing are transported on the remote destination.

So I have situation like this:

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root@server (/backup) $ df -h

Filesystem Size Used Avail Use% Mounted on

/dev/md3 50G 47G 114M 100% /backup

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On the local temp backup destination was over 70 backup archives waiting for transport on the remote backup destination:

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root@server (/backup/weekly/2015-08-23/accounts) $ ll |wc -l

77

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So I'm running out of space on temporary local backup partition and new backup archives are not created successfully once disk usage exceeded 100%.

In short, this request is to implement backup pause (like is implemented pause at high cpu load) based on free space left on backup partition.