This button downloads your wiki with a date-time stamped filename as a backup.
I made this specifically for use on TiddlyHost.
Tag it $:/tags/PageControls to have it appear on the sidebar toolbar.
<$button class="tc-btn-invisible" tooltip="Download with datetime stamp">
<$action-sendmessage
$message="tm-download-file"
filename={{{ [{$:/info/url/host}] [<now YYYY0MM0DD-0hh0mm0ss>] +[join[-]] +[addsuffix[.html]]}}}/>
{{$:/core/images/download-button}}
</$button>
TO use this on a local