Will a Backup Process pause/suspend when a Backup is being moved by Additional Destinations?

Question

Will a Backup Process pause/suspend when a Backup is being moved by Additional Destinations?

Answer

If your server has more than one account, and the Backup Configuration is moving the backup to an Additional Destinations, you may wish to know if the Backup process will pause while another account is moving.

The Backup process runs separately from Additional Destinations.

You can see in the Backup logs, that when a Backup is created, it is added to a Queue for Additional Destinations.

Example (notice time): 

/usr/local/cpanel/logs/cpbackup/1612712974.log

[2021-02-07 09:49:56 -0600] info [backup] Queuing daily backup copy of “cptest5” for transport of “/bac
kup/2021-02-07/accounts/cptest5.tar.gz” to “2021-02-07/accounts/cptest5.tar.gz”
[2021-02-07 09:49:56 -0600] info [backup] This particular transport will be queued with keep_local = 0
, based on the need to copy weekly () and/or monthly () copies as well.
[2021-02-07 09:49:56 -0600] info [backup] Queuing transport of file: /backup/2021-02-07/accounts/cptest
5.tar.gz
[2021-02-07 09:49:56 -0600] info [backup] no_transport = 0 .. and queueid = TQ:TaskQueue:67
[2021-02-07 09:49:56 -0600] info [backup] leaving queue_backup_transport_item

Then, the backup process will continue to the next Backup, without referencing the Additional Destinations.

Example (notice time continues):

/usr/local/cpanel/logs/cpbackup/1612712974.log

[2021-02-07 09:49:56 -0600] info [backup] Calling pkgacct under cpuwatch to backup user “cptest”
[2021-02-07 09:49:56 -0600] pkgacct started.
[2021-02-07 09:49:56 -0600] pkgacct version 10 - user : cptest - tarball: 1 - target mysql : default -
split: 0 - incremental: 0 - homedir: 1 - mailman: 1 - backup: 1 - archive version: 4 - running with uid
0
[2021-02-07 09:49:56 -0600] pkgacct using '/usr/local/cpanel/3rdparty/bin/pigz -6 --processes 1 --block
size 4096 --rsyncable' to compress archives
[2021-02-07 09:49:56 -0600] pkgacct working dir : /backup/2021-02-07/accounts/cptest

This has the overall effect of Backup continue to process, while Additional Destinations are Transported. 

If the server is low on disk space, this can allow Backup to fill up the disk; even if the option "Retain Backups in the Default Backup Directory" in Backup is turned off.