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I'm afraid no config option should control wether a plain ampersand or parenthesis character is parsed by the interpreter when enclosed in double or even single quotes. We have found this to be happening even on commented out lines, thus is seems to be a bug.

UPDATE 1:

We have found that VMWare has upgraded Busybox from v 1.22 to 1.29 in their latest minor update ESXi 6.7 U2
The bash interpreter bundled with this Busybox version treats some text inside quotes, even single quotes ;-( as code and tries to parse it through the interpreter instead of escaping it. We have found this to happen with parenthesis and ampersands, but may affect other characters too.

This apparent bug will affect, not only XSIBackup, but any other bash scripts that may be needed by ESXi, including service scripts.

We recommend that you skip this build by now and wait to see if VMWare does something in regards to this issue.

UPDATE 2:

As per our latest tests, it seems to be affecting even commented out text, so we believe this to be a Busybox/ ESXi bug.

We have confirmed this to be a compatibility issue with ESXi 6.7U2, the problem was already fixed. [url=https://33hops.com/download-form.html]Download latest version[/url]

This error is due to some changes in the keep alive policy of the SSH server in the sshd_config file. You can easily tweak that to prevent these errors by increasing the keep alive interval. We might include this adjustments to be performed by XSIBACKUP-PRO in some future version, although being something affecting your security profile, we'll leave it to the sysadmin by now.

And you are backing up from which version?
Please post all the relevant facts.

We are sorry, but this is probably not the most adequate site to place questions about setting the time of your ESXi server

You don't need Pro if you have a nice bandwidth through the VPN and you trust your backups without any further checksum certification. Just use the datastore as you would do with any other local storage resource. Enable async NFS to improve transfer speed.

[url=https://communities.vmware.com/thread/596950]Configure Time Zone in (c)ESXi[/url]

Remove the comments from the job file and leave the commands starting with this line:

"/vmfs/volumes/backup/xsi-dir/xsibackup" \

We aren't trying to be unpolite, but just clear. XSIBackup is not a closed featured piece of software. As stated before, it may produce any result, depending on the user actions.

We have thoroughly tested that switch and we have not been able to reproduce your issue so far. Nobody else has reported such bug either among many thousands of users.

That leads us to believe your outcome is due to some particular condition in your system. Remember that XSIBackup does not support manufacturer builds.

We may some day dedicate a post to REGEXP patterns, but by now, it's a general purpose tecnology which is well stablished and well documented in a multitude of websites, i.e.:
[url=https://www.digitalocean.com/community/tutorials/using-grep-regular-expressions-to-search-for-text-patterns-in-linux]Rgexp tutorial[/url]

You are the sysadmin of your system, you may debug to find out why that is happening or ask somebody else to do it for you.
XSIBackup is extremely flexible, as some functionality is based in scripts, you may very well do something that produces any result.
We can debug that for you, but if it turns out to be some error from your part, we will charge for our time.