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I use it for nearly the same thing. It seems to me like the best solution to back up to rsync.net. Other tools that claimed to support rsync, like FolderSync, didn't actually work. It also helps that termux can avoid cron and instead uses termux-job-scheduler to get around power saving issues.[1]
[1] https://github.com/termux/termux-app/issues/2015
Termux has an open source repository of packages. It's similar to arch, debian, alpine, etc. https://github.com/termux/termux-packages
Termux doesn't get special privileges unless you root your device. It can't go messing with your phone data unless you granted it permission to do so (but even then it doesn't have access to everything). It's no worse than any other Android app IMHO.
Not exactly the same but wanted to share what has wprked wonders for me for years. I needed to run a terminal multiplexer on a remote machine, SSH into it, and be able to use emacs (key bindings and all) on my Pixel 5.
I found this combination of now defunct open source apps worked better than any I've tried.
https://github.com/irssiconnectbot/irssiconnectbot
I use it termux mainly to ssh to a server but also to ssh from my laptop to the phone by running sshd inside termux. By using scp and with the right ssh host config and authorized_keys I can send and receive files across devices, really useful when devices are on the same VPN but not on the same network.
I also use Termux:Widget [1] to launch scripts. For example, I have added all my contacts to abook [2], and with a bash script that use fzf I can filter my contacts and it automatically get the contact gps field and automatically start the navigation.
[1]https://github.com/termux/termux-widget
[2] https://abook.sourceforge.io/
Do you mean with a BT keyboard attached to the tablet? One approach is to use keymapper:
market: https://play.google.com/store/apps/details?id=io.github.sds1...
github: https://github.com/keymapperorg/KeyMapper
fdroid: https://f-droid.org/packages/io.github.sds100.keymapper/
It's a very versatile tool, can be handy even if you don't have a keyboard.
When I was a volunteer sysadmin, I sometimes used Termux to ssh into the servers I managed. More than once I triaged an incident from the same phone that paged me about it, while I was on a bus or train commuting to my day job.
mosh[1] was especially useful for this over mobile data.
[1]: https://mosh.org/