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I have a website with Drupal CMS behind it. I use a custom theme and I would like to change it but I am not sure if it is entirely safe, i.e. is it possible to lose some data, design, etc if I switch it back to my theme? What about blocks and their position if the theme uses different blocks layout. Thanks.
It should be safe, but you should have a current backup of the database and files anyways. You can (and probably should) set the administration theme to one of the standard themes, so you can’t lock yourself out of the admin section if you break your custom theme.
If the regions are named different (or missing in one theme) you may have to move your blocks. The blocks are set seperately for every theme, so just enable the second theme (without setting it a default) and set the blocks for this theme. After that you can set the theme as default.
I use a copy of the website to try out bigger changes to the site, so that I never break the live site. It makes it much easier and safer to just try out stuff.