Why I cannot create a new Backup of my website Himetop- The History of Medicine Topographical database? (it is about 4,4, GB). Thank you,

There is an error in the line formatting that starts at 'Benutzer-Bild' and visible at Delete account 'Loschen des Kontos'.

I can't create full backups of my site (scp-ru.wikidot.com) with files included.
There's approx. 650 megabytes of used space, backup is in .tar.gz format, doesn't matter whether it's "files only" or "pages and files". "Pages only" backups do work. There are no other backups that I can delete.
Whenever I try to create a backup, it says "processing" for about 5-7 minutes, then stops with a message along the lines of "Failed to create backup, will attempt again in 30 minutes".

http://vandi-kalsi-eric-bra-vandi-kalsi-eric-bradshaw.wikidot.com/admin:themes

Hello there on my acount the search possebilety is not working, how can i make it work ?

Lately as I create new pages they are not appearing in the search results. This is tough since I have no other way (that I am aware of) of getting to the content. I am essentially losing content unless I put a link to it on one of the other pages that DOES respond to a query. But since I can't find the pages I can't get the url's to put into another page!!

Since a couple of days ago our small wiki suddenly started getting ads to stores disguised as wiki links.
The word "wire" suddenly becomes a link to home depot, "drones" becomes a link to Amazon and so on and so forth. This only happens when the user is not logged in.

As of yesterday (April 10, 2016) the ListPages module has stopped updating new content added to or removed from our site (http://cmbeta.wikidot.com)

From this community post, a layout with an id specified (eg. id="top") would not save, as is expected. However, the error message says thus:

Addthis sharing buttons are down across all my sites. This also seems to be related to the comments I made here: http://feedback.wikidot.com/wish:101