Is there a reliable way to backup Telegram conversations including media? It seems like a good idea to make some before they change the endless storage and scroll back, just in case.
There is also third party software for it that has more options, the internal one is a bit limited. Some are based on tg-cli, so they're not redoing the work of implementing a client but just format the history into an archive format. I think the project that I contributed to (years ago) was called something like Telegram history formatter.
Backups of your data are always a good idea, regardless of who owns it. Triply so if the service is a bit shady (no business model, for instance). I learned that lesson the hard way with Grooveshark (which totally had a business model and did basically the same as YouTube till someone found evidence of the authors uploading copyrighted stuff themselves, but until then it seemed more stable than Telegram seems today).