SSD Security - What if someone steals my SSD?

If someone steals the SSD that’s connected to my Raspberry Pi Umbrel OS, will they be able to acess my Bitcoin Node, App files, specially Nextcloud files?

If not, is there any way i can VeraCrypt my SSD and use Umbrel OS?

not 100% sure, you could plugin the ssd and see which files are available under Linux system
when you use umbrel it will ask for password
even better with 2FA
don’t think there is a high change someone can do something with it (when a casual dump criminal) steals your ssd he will not be able to do something with it.

Veracrypt from stock not possible. but could be if you code special startup script. this takes a lot of effort and can cause other issues as well.